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* What is new in gsl-2.8:

** apply patch for bug #63679 (F. Weimer)

** updated multilarge TSQR method to store ||z_2|| and
   provide it to the user

** add routines for Hermite B-spline interpolation

** fix for bug #59624

** fix for bug #59781 (M. Dunlap)

** bug fix #61094 (reported by A. Cheylus)

** add functions:
   - gsl_matrix_complex_conjugate
   - gsl_vector_complex_conj_memcpy
   - gsl_vector_complex_div_real
   - gsl_linalg_QR_lssolvem_r
   - gsl_linalg_complex_QR_lssolvem_r
   - gsl_linalg_complex_QR_QHmat_r
   - gsl_linalg_QR_UR_lssolve
   - gsl_linalg_QR_UR_lssvx
   - gsl_linalg_QR_UR_QTvec
   - gsl_linalg_QR_UU_lssvx
   - gsl_linalg_QR_UD_lssvx
   - gsl_linalg_QR_UD_QTvec
   - gsl_linalg_complex_cholesky_{decomp2,svx2,solve2,scale,scale_apply}
   - gsl_linalg_SV_{solve2,lssolve}
   - gsl_rstat_norm

** add Lebedev quadrature (gsl_integration_lebedev)

** major overhaul to the B-spline module to add
   new functionality

* What was new in gsl-2.7.1:

** update libtool version numbers

* What was new in gsl-2.7:

** fixed doc bug for gsl_histogram_min_bin (lhcsky at 163.com)

** fixed bug #60335 (spmatrix test failure, J. Lamb)

** fixed bug #36577

** clarified documentation on interpolation accelerators (V. Krishnan)

** fixed bug #45521 (erroneous GSL_ERROR_NULL in ode-initval2, thanks to M. Sitte)

** fixed doc bug #59758

** fixed bug #58202 (rstat median for n=5)

** added support for native C complex number types in gsl_complex
   when using a C11 compiler

** upgraded to autoconf 2.71, automake 1.16.3, libtool 2.4.6

** updated exponential fitting example for nonlinear least squares

** added banded LU decomposition and solver (gsl_linalg_LU_band)

** New functions added to the library:
      - gsl_matrix_norm1
      - gsl_spmatrix_norm1
      - gsl_matrix_complex_conjtrans_memcpy
      - gsl_linalg_QL: decomp, unpack
      - gsl_linalg_complex_QR_* (thanks to Christian Krueger)
      - gsl_vector_sum
      - gsl_matrix_scale_rows
      - gsl_matrix_scale_columns
      - gsl_multilarge_linear_matrix_ptr
      - gsl_multilarge_linear_rhs_ptr
      - gsl_spmatrix_dense_add (renamed from gsl_spmatrix_add_to_dense)
      - gsl_spmatrix_dense_sub
      - gsl_linalg_cholesky_band: solvem, svxm, scale, scale_apply
      - gsl_linalg_QR_UD: decomp, lssolve
      - gsl_linalg_QR_UU: decomp, lssolve, QTvec
      - gsl_linalg_QR_UZ: decomp
      - gsl_multifit_linear_lcurvature
      - gsl_spline2d_eval_extrap

** bug fix in checking vector lengths in gsl_vector_memcpy (dieggsy@pm.me)

** made gsl_sf_legendre_array_index() inline and documented
   gsl_sf_legendre_nlm()

* What was new in gsl-2.6:

** add BLAS calls for the following functions:
     - gsl_vector_memcpy
     - gsl_vector_scale
     - gsl_matrix_memcpy
     - gsl_matrix_transpose_memcpy
     - gsl_matrix_tricpy
     - gsl_matrix_transpose_tricpy

** deprecated functions gsl_linalg_complex_householder_hm and
   gsl_linalg_complex_householder_mh

** add unit tests for gsl_linalg_symmtd and gsl_linalg_hermtd

** multilarge TSQR algorithm has been converted to use the new Level 3 QR decomposition

** nonlinear least squares Cholesky solver now uses the new Level 3 BLAS
   method; the old modified Cholesky solver is still available under
   gsl_multifit_nlinear_solver_mcholesky and gsl_multilarge_nlinear_solver_mcholesky

** implemented Level 3 BLAS versions of several linear algebra routines:
     - Triangular matrix inversion
     - Cholesky decomposition and inversion (real and complex)
     - LU decomposition and inversion (real and complex)
     - QR decomposition (courtesy of Julien Langou)
     - Generalized symmetric/hermitian eigensystem reduction to standard form

** removed deprecated function gsl_linalg_hessenberg()

** renamed gsl_interp2d_eval_e_extrap() to gsl_interp2d_eval_extrap_e()
   to match documentation (reported by D. Lebrun-Grandie)

** renamed some of the gsl_sf_hermite functions to be more consistent
   with rest of the library, and deprecated old function names

** updated gsl_sf_hermite_func() to use a newer algorithm
   due to B. Bunck which is more stable for large x; also added
   gsl_sf_hermite_func_fast() which uses the faster Cauchy integral
   algorithm in the same paper by Bunck

** add gsl_vector_axpby()

** add un-pivoted LDLT decomposition and its banded
   variant (gsl_linalg_ldlt_* and gsl_linalg_ldlt_band_*)

** add binary search tree module (gsl_bst); based on GNU libavl

** remove -u flag to gsl-histogram

** updated spmatrix module
   - added routines and data structures for all types (float,uint,char,...)
   - added gsl_spmatrix_scale_columns() and gsl_spmatrix_scale_rows()
   - added gsl_spmatrix_add_to_dense()
   - more efficient reallocation of COO/triplet matrices (no longer rebuilds binary tree)
   - enhanced test suite
   - added gsl_spmatrix_min_index()

** add routines for banded Cholesky decomposition (gsl_linalg_cholesky_band_*)

** documented gsl_linalg_LQ routines and added gsl_linalg_LQ_lssolve()

* What was new in gsl-2.5:

** doc bug fix in binomial distribution figure (Damien Desfontaines)

** added Wishart distribution (Timothée Flutre)

** added new module for digital filtering (gsl_filter); current filters include:
     Gaussian filter
     median filter
     recursive median filter
     impulse detection filter

** added new module for moving window statistics (gsl_movstat)

** added statistics functions:
     gsl_stats_median()
     gsl_stats_select()
     gsl_stats_mad()
     gsl_stats_mad0()
     gsl_stats_Sn_from_sorted_data()
     gsl_stats_Qn_from_sorted_data()
     gsl_stats_gastwirth_from_sorted_data()
     gsl_stats_trmean_from_sorted_data()

** added Romberg integration (gsl_integration_romberg)

** bug fix in deprecated functions gsl_multifit_wlinear_svd and
   gsl_multifit_wlinear_usvd (reported by Vlad Koli)

** documentation corrected to state that gsl_sf_legendre functions do
   not include Condon-Shortley phase by default

** bug fix in exponential fitting example when using larger number
   of points (reported by Anna Russo)

** changed internal workspace inside gsl_spmatrix to a union to
   avoid casting (suggested by Manuel Schmitz)

** bug fixes in ode-initval2 for very rare solver crashing cases:
   #52230 in msadams (reported by Michael Kaufman) and
   #52336 in msbdf (reported by Andrew Benson). As a fix,
   the maximum scaling of controlled step length was decreased
   from 5.0 to 4.9.

** add histogram2d figure to manual (was missing in 2.4)

** bug fix in gsl_spmatrix_add for duplicate input arguments
   (reported by Alfredo Correa)

** add support for negative arguments nu in gsl_sf_bessel_Jnu and
   gsl_sf_bessel_Ynu (Konrad Griessinger)

** better texinfo documentation for gsl_sf_hyperg functions

** fix vector and matrix fread/fwrite testing on windows systems
   when tmpfile() fails

** fix for rstat/test.c on PPC64 (reported by Adam Majer)

* What was new in gsl-2.4:

** migrated documentation to Sphinx software, which has built-in
   support for latex equations and figures in HTML output

** add const to declaration of appropriate gsl_rstat routines

** bug fix for #45730: change gsl_sf_sin/cos to libm sin/cos

** fix Cholesky documentation regarding upper triangle on output

** added routines to compute integrals with fixed-point quadrature,
   based on IQPACK (Konrad Griessinger)

** added routines for Hermite polynomials, gsl_sf_hermite_*
   (Konrad Griessinger)

** added new nonlinear least squares example for fitting
   a Gaussian to data

** deprecated routines:
     gsl_sf_coupling_6j_INCORRECT
     gsl_sf_coupling_6j_INCORRECT_e

** deprecated routine 'gsl_linalg_hessenberg' (replaced
   by gsl_linalg_hessenberg_decomp)

** removed routines which were deprecated in v2.1:
     gsl_bspline_deriv_alloc
     gsl_bspline_deriv_free

** changed COD expression to Q R Z^T instead of Q R Z to
   be consistent with standard texts

** added check for nz == 0 in gsl_spmatrix_get
   (reported by Manuel Schmitz)

** permit zero-dimension blocks, vectors, matrics, subvectors,
   submatrices, and views of the above (bug #49988)

** added routine gsl_linalg_COD_lssolve2 for regularized
   least squares problems

* What was new in gsl-2.3:

** bug fix in documentation for gsl_linalg_LU_refine
   (bug #49728, Joey De Pauw)

** added gsl_multifit_linear_tsvd and gsl_multifit_wlinear_tsvd
   to give user more control over cutoff for truncated SVD

** added routines for Generalized Cross Validation for
   regularized linear least squares

** improved rstat example program and added documentation for
   gsl_rstat_sd_mean (Jonathan Leto)

** added function gsl_multifit_linear_rank

** bug fix in nonlinear least squares when using data weights with
   finite-difference Jacobian

** add 2D subspace method for large systems (multilarge_nlinear)

** bug fix in gsl_ran_beta for small parameters
   (bug #47646, Yu Liu)

** bug fix in gsl_complex_tan for negative imaginary arguments
   (bug #47347, Yu Liu)

** doc bug fix: value of golden ratio

** fixed scaling issue in 2D subspace nonlinear least squares
   method

** optimize dogleg methods to calculate Gauss-Newton point
   only when needed

* What was new in gsl-2.2.1:

** reverted gsl_linalg_cholesky_decomp to its previous behavior
   so it is backward compatible; new cholesky routine is
   gsl_linalg_cholesky_decomp1

* What was new in gsl-2.2:

** updated gsl_linalg_cholesky_invert to use Level-2 BLAS
   and added function gsl_linalg_pcholesky_invert

** added functions gsl_linalg_tri_*_invert for inverting
   triangular matrices

** fix GSL_EIGEN_SORT_VAL_{ASC,DESC} for nonsymmetric
   eigensystems (Victor Zverovich)

** added complete orthogonal decomposition routines
   (gsl_linalg_COD)

** bug fix where median calculation wasn't reset in
   gsl_rstat_reset(); added gsl_rstat_quantile_reset() function
   (reported by Pedro Donato)

** added multivariate Gaussian random distribution
   gsl_ran_multivariate_gaussian (Timothée Flutre)

** added functions to estimate the 1-norm reciprocal condition
   number for various matrix factorizations:
     * gsl_linalg_cholesky_rcond
     * gsl_linalg_QRPT_rcond

** added functions gsl_linalg_QRPT_{lssolve,lssolve2} to
   compute least squares solutions with the QRPT decomposition

** added function gsl_permute_matrix()

** added modified Cholesky factorization (gsl_linalg_mcholesky)
   to handle symmetric indefinite matrices

** added pivoted Cholesky factorization (gsl_linalg_pcholesky)
   for ill-conditioned matrices

** rewrote (real) Cholesky decomposition to use
   a Level-2 blas algorithm instead of Level-1. Flop
   count is about the same but the code is much simpler
   and easier to follow

** completely rewritten nonlinear least squares module,
   including support for large problems; the user may
   now control the linear solver used, the trust region
   updating strategy, and the scaling method. In addition,
   support has been added for the geodesic acceleration
   step (Transtrum 2011) which can speed up convergence
   on a wide class of problems.

** added gsl_rstat_rms() for root mean square

** optimized lmniel nonlinear least squares solver
   (bug #46369)

** improved precision in Bessel K0/K1 near x = 2
   (Pavel Holoborodko, bug #47401)

** added support for compressed row storage sparse
   matrices (Alexis Tantet)

** bug fix in convergence check of hypergeometric 2F1
   function (bug #45926)

** added gsl_multilarge_linear_lcurve() to compute
   the L-curve for large linear systems

** updated multilarge normal equations method to use
   new Cholesky scaling for better numerical stability

** added scaling to Cholesky routines to reduce the
   condition number prior to factorization

* What was new in gsl-2.1:

** added test suite for example programs

** bug fix when compiling with #undef GSL_DISABLE_DEPRECATED

** bug fix in setting libtool age versioning

** bug fix in gsl_multifit_wlinear()

** added gsl_multifit_linear_rcond() to compute reciprocal
   condition number of least squares matrix

** added gsl_multilarge module for large linear least squares
   systems

* What was new in gsl-2.0:

** fixed bug #43258 for hypergeometric functions (Raymond Rogers)

** added L-curve analysis routines for linear Tikhonov regression

** add running statistics module

** added bilinear and bicubic interpolation (David Zaslavsky)

** added function gsl_multifit_robust_residuals to compute robust
   fit residuals

** added Steffen monotonic interpolation method (Jean-François Caron)

** added new nonlinear least squares solver 'lmniel' suitable for
   systems with large numbers of data

** nonlinear least squares solver now tracks the number of function
   and Jacobian evaluations, see example program for details

** the 'fdf' field of gsl_multifit_function_fdf is now deprecated
   and does not need to be specified for nonlinear least squares
   problems

** added extensive test suite to nonlinear least squares module,
   resulting in a few minor bug fixes; the routine
   gsl_multifit_fdfsolver_driver has been rewritten (with API change)
   to handle the various error codes of the lmsder iterate
   routine, resulting in a high level caller which is highly robust
   for a wide class of problems

** added support for sparse matrices, including a GMRES
   iterative linear solver

** added routines gsl_linalg_givens and gsl_linalg_givens_gv
   for Givens rotations

** added Tikhonov (ridge) regularization to least squares module
   (linear and nonlinear)

** removed unused argument 'n' from gsl_sf_ellint_D

** merged bspline_deriv_workspace into bspline_workspace to simplify
   bspline API; the functions
     gsl_bspline_deriv_alloc
     gsl_bspline_deriv_free
   are now deprecated and will be removed in a future release.

** merged ALF extension into GSL for associated Legendre functions;
   api has changed; consequently the functions:
     gsl_sf_legendre_Plm_array
     gsl_sf_legendre_Plm_deriv_array
     gsl_sf_legendre_sphPlm_array
     gsl_sf_legendre_sphPlm_deriv_array
     gsl_sf_legendre_array_size
   are now deprecated and will be removed in a future release.

** added function gsl_multifit_robust_weights to allow user to
   access the various weighting functions

* What was new in gsl-1.16:

** fixed error in gsl_rng_fwrite where uninitialized padding
   bytes were being written (bug #39104)

** fixed error in gsl_block_alloc where padding bytes were not
   properly initialized (bugs #39101,#39102,#39103)

** fixed error in ntuple/test.c where padding bytes were not
   properly initialized (bug #39105)

** fixed triangle selection bug in gsl_sf_coupling_6j_e and
   gsl_sf_coupling_9j_e (bugs #39466 and #29606) (Håkan Johansson and
   Alexey Illarionov)

** added higher level wrapper routine gsl_multifit_fdfsolver_driver

** converted gsl_multifit_linear_residuals to use dgemv to improve
   efficiency (bug #39153)

** added functions gsl_stats_spearman and gsl_sort_vector2 to compute
   Spearman rank correlation

** added function gsl_poly_dd_hermite_init for Hermite interpolation

** Added support for robust linear least squares

** Added function gsl_linalg_SV_leverage for computing statistical
   leverages from SVD decomposition

** Added support for approximating the Jacobian of nonlinear least
   squares fits using forward finite differences

** Extended gsl_sf_coupling_3j to allow larger range and to handle
   the special case (ja jb jc; 0 0 0)=0 when ja+jb+jc is odd

** Fixed gsl_sf_mathieu_se_array to return zero when the order is zero
   [bug #33679].

** Fixed overflow in gsl_sf_lncosh for large negative x (x= UINT_MAX [bug
   #24897]

** Added gsl_bspline_eval_deriv to compute bspline derivatives
   (Rhys Ulerich)

** Added a faster simplex mininimser gsl_multimin_fminimizer_nmsimplex2
   which is O(N) instead of O(N^2) [bug #24418]

** Improved the original chi-squared formula in gsl_monte_vegas to
   avoid catastrophic cancellation [bug #24510].  The previous formula
   could return incorrect or negative values for relative errors <
   1e-8, which could occur when integrating very smooth functions.

** Added new auxiliary functions gsl_cheb_order, gsl_cheb_size,
   gsl_cheb_coeffs for Chebyshev series [bug #21830]

** Updated license of the reference manual to GNU FDL version 1.3.

** Fixed a bug where the gsl_isinf function would return +1 for -Inf
   on systems where isinf(-Inf) returns the non-standard value +1.
   [bug #24489]

** Added missing functions gsl_vector_complex_{isnonneg,add,sub,mul,
   div,scale,add_constant} and gsl_matrix_complex_float_isnonneg [bug
   #22478]

** Cross compilation should now work for x86 hosts.

** Fixed a bug in gsl_interp_accel_find() where values lying on the
   upper boundary between interpolation points could return the index
   from the lower side. [bug #24211]

** Fixed gsl_linalg_solve_cyc_tridiag so that its output respects the
   solution vector's stride. Previously the x_stride value was ignored
   causing the output to be incorrect for non-unit stride. [bug #24162]

** Corrected a bug in the series calculation of gsl_sf_ellint_Kcomp
   for k close to 1. [bug #24146]

** Extended gsl_linalg_QRPT_update to handle rectangular matrices.
   Corrected definition of the update formula in the manual for
   both gsl_linalg_QR_update and gsl_linalg_QRPT_update.

** Added routine gsl_linalg_cholesky_invert

** Fixed a bug the simplex algorithm which caused the second highest
   point to be incorrectly equal to the first when the first value was
   the highest, which could cause suboptimal convergence. [bug #23192]

** Fixed a problem with convergence for inverse gamma and chisq
   distribitions, gsl_cdf_gamma_{P,Q}inv and gsl_cdf_chisq_{P,Q}inv.
   [bug #23101]

** Improved the handling of constant regions in Vegas by eliminating
   spurious excess precision when computing box variances.

** Fixed a potential division by zero in gsl_monte_miser when the
   left/right weight factors decrease below 1.

** Fixed incorrect dimensions check in gsl_matrix_sub{row,column}

* What was new in gsl-1.11:

** The GSL repository and bug database are now hosted at Savannah
   http://savannah.gnu.org/projects/gsl/

** Upgraded to latest libtool, autoconf and automake (libtool-2.2,
   autoconf-2.61, automake-1.10.1)

** Fixed underflow in ODE adaptive step size controller that could
   cause step size to decrease to zero (bug #21933).

** Improved the handling of the asymptotic regime in gsl_sf_bessel_jl.

** Improved the handling of large arguments in cumulative distribution
   functions using the incomplete beta function, such as gsl_cdf_fdist_P.

** Fixed overflow bug in gsl_cdf_hypergeometric_{P,Q} for large
   arguments (bug #22293).

** gsl_ran_gaussian_ziggurat now handles generators with different
   ranges explicitly, to minimise the number of function calls
   required (bug #21820).  Also fixes bug #22446 (rng limit in
   gsl_ran_chisq()).

** Added missing error terms in gsl_sf_exp_mult_e10_e to prevent
   the error being underestimated (bug #22041).

** Updated some constants to the CODATA 2006 values.

** The hypergeometric function gsl_sf_hyperg_2F1 now handles the case
   where x==1.

** Fixed a bug in the brent minimiser which prevented optimal convergence.

** Added functions for evaluating complex polynomials

** The convergence condition for gsl_multiroots_test_delta now accepts
   dxi == 0.

** Improved functions gsl_ldexp and gsl_frexp to handle the full range
   of double precision numbers in all cases.

** Added new quasi random generators gsl_qrng_halton and
   gsl_qrng_reversehalton which support dimensions up to 1229.

** Added function gsl_multifit_linear_residuals for computing the
   residuals of the fit

* What was new in gsl-1.10:

** License updated to GNU GPL version 3.

** Added support for generalized eigensystems

** Added function gsl_stats_correlation to compute Pearson correlation
of two datasets

** Added the new function gsl_sf_expint(n,x) for computing the n-th
order exponential integral.

** Added functions gsl_vector_isnonneg and gsl_matrix_isnonneg.

** Added functions gsl_matrix_subrow and gsl_matrix_subcolumn

** Extended Cholesky routines to complex matrices

** Added support in gsl_ieee_set_mode for controlling SSE exceptions
and rounding through the MXCSR control word on x86 processors.

** The autoconf macro AM_PATH_GSL has been renamed to AX_PATH_GSL, to
avoid conflicts with the autoconf namespace.

** Improved handling of underflow in gsl_eigen_symm.

** The function gsl_multiroot_fdjacobian now returns the error code
GSL_ESING if any of the columns of the computed jacobian matrix are
zero.  This may occur if the step size of the derivative is too small.

** Extended the function gsl_sf_beta_inc(a,b,x) to handle cases where
a>l*l in the asymptotic expansion.

** The scaled bessel function gsl_sf_bessel_In_scaled now handles
larger arguments x > 1e7 correctly for n < 150 using the uniform
asymptotic expansion instead of the continued fraction expansion.

** The functions gsl_stats_min/max now return NaN if the data contains
NaN. Similarly, the functions gsl_stats_min/max_index return the index
of the first occurring NaN in the data when it contains a NaN.

** Fixed an invalid memory access that caused incorrect results for
the special case in periodic cubic spline interpolation of 3 points.

** Added Debye functions for n=5 and n=6

** Added the missing functions gsl_spline_name() and
gsl_spline_min_size()

** The function gsl_rng_uniform_int(r,n) now returns an error for n=0,
which can occur when passing an unsigned integer value of 2^32.

* What was new in gsl-1.7:

** Switched gsl_randist_binomial to use the faster binomial random
variate TPE algorithm by default.  The previous binomial variate
algorithm is available as gsl_randist_binomial_knuth.  This will
result in a different sequence of binomial variates in programs using
this function.

** Improved the algorithm for gsl_sf_elljac_e to avoid cancellation
errors near quarter periods.

** Fixed the branch selection in gsl_sf_gamma_inc_Q_e to avoid
inaccurate results for large a,x where x~=~a.

** The multilinear fitting functions now have forms which accept a
user-specified tolerance for the SVD cutoff and return the
corresponding effective rank of the design matrix.

** The quadratic solvers in poly/ now handle linear equations
gracefully (i.e. quadratrics with a leading coefficient of zero).

** The output of "make check" now only shows test failures by default,
to reduce the amount of output.  Set the environment variable
GSL_TEST_VERBOSE=1 to display all the output.  To assist debugging,
the test number of each failure is shown in square brackets at the
line-end [NNNN].

** Fixed bugs in gsl_linalg_SV_decomp_jacobi which caused
incorrect results for some input matrices.

** Bessel, coulomb, dilogarithm and legendre_H3d functions now use
hypot internally to avoid overflow when computing terms like
sqrt(1+x*x).

** The 'Usage' chapter of the reference manual now explains how to
handle deprecated functions using the GSL_DISABLE_DEPRECATED macro.

** The conflicting enum definitions for 'forward' and 'backward' in
gsl_ftt.h and gsl_wavelet.h are deprecated.  User code should switch
to the new definitions gsl_fft_forward, gsl_fft_backward,
gsl_wavelet_forward and gsl_wavelet_backward. Selectively define
GSL_DISABLE_DEPRECATED before including the headers to use the new
definitions on either or both modules.

** Fixed an error in the the brent minimisation algorithm.  Iterations
should now follow Brent's original description correctly.

** The bound coulomb function gsl_sf_hydrogenicR_e no longer reports
an underflow for exact zeroes of the wavefunction.

** gsl_linalg_SV_decomp_jacobi now reports an error for the
unimplemented case M>N) use the LQ decomposition,
solving the transpose of the original system.  This allows more
efficient memory access, and is useful for solving large least-squares
problems.

** Fixed a bug in the SYRK and HERK blas functions gsl_blas_{s,d,c,z}syrk
and gsl_blas_{c,z}herk which caused invalid memory access for non-square
matrices.

** Fixed a bug in gsl_swap_vectors which caused it to return incorrect
results when swapping vectors with different strides.

** Corrected the error estimate for gsl_cheb_eval_n_err to use
evaluation order instead of the approximation order.

** Improved the reliability of the gsl_sf_gamma_inc family of
functions.

** Equal abscissae are now handled gracefully in the cspline and
periodic cspline interpolations.

** Removed potential cancellation error in calculation of uniform
histogram ranges.

** Improved numerical stability of integration for akima and cspline
interpolation.

** Differential equation solvers now handle error codes returned from
user-defined functions.

** Improved error estimates in ode-initval solvers, and provide exact
derivatives on output.  Added new semi-implicit ode-initval solver,
gsl_odeiv_step_rk2simp.

** Added missing function definition for gsl_sf_psi_1.

** Fixed the function gsl_sf_expint_Ei_scaled to call
gsl_sf_expint_Ei_scaled_e instead of gsl_sf_expint_Ei_e.

** Added cumulative distribution function for exponential power
distribution.

** The functions gsl_cdf_beta_P and gsl_cdf_beta_Q now return
consistent results of 0 or 1 for out of range values, x1,
rather than 0 for left and right tails simultaneously.

** The Jacobi eigensolvers gsl_eigen_jacobi and gsl_eigen_jacobi_invert
have new implementations from Golub and Van Loan.

** The standard output and standard error streams are now flushed by
the default error handler before the program aborts, in order to
ensure that error messages are properly displayed on some platforms.

* What was new in gsl-1.5:

** Multifit routines now handle iterations where |f| is already
minimised to zero, without division by zero.

** Fixed the singular value tolerance test in the multifit covariance
calculation from < to