Version 0.52.2 (2006-02-09)
  - bugfix in hpic_nsidecheck
  - use atan2 in hpic_vec2ang
  - fix configure script so that AM_CPPFLAGS and AM_LDFLAGS
    are used when checking for headers and libraries.

Version 0.52 (2005-11-12)
  - add support for full-sphere "chunk" FITS files that use 
    column widths of 1E rather than 1024E and which contain 
    a subset of the full-sphere data.  I have seen such files
    several places...
  - fix freeing in hpic_keys_del

Version 0.51 (2005-10-24)
  - fix bug in nearest neighbors function (from C++ port
    of healpix code).

Version 0.50 (2005-10-01)
  - Add hpic_outline tool, for detecting boundary pixels
  - Fix equality comparison in hpic_thresh
  - Change low level pixel routines to use same method
    as Healpix_cxx (should be faster)
  - Add configure checks for pthreads and implement locking
    for global pixel initializations
  - Bitwise ops in hpic_nsidecheck
  - Rename all functions to form of hpic_* in order to have
    a consistent namespace.
  - Move all old functions to hpic_legacy.c
  - hpic_fits_map_test and hpic_fits_map_info now check that
    the binary table is the correct length.
  - Perl interface updated.

Version 0.49 (2005-06-06)
  - Add hpic_fits_map_info and hpic_fits_vec_info
  - Make sure to close FITS files if reading the table header
    fails.
  - Use correct type in realloc of fkeyvals in hpic_keys_fadd

Version 0.48 (2005-04-05)

  - Update Manual
  - Add more input checking in FITS read functions
  - Zero out memory when a vector gets resized, but memory is not
    realloc'ed.
  - All new POSIX-style error handling.
  - When reading cut-sphere FITS files, set maps to NULL before
    reading data vectors.
  - Fixed Perl section of manual for functions that return arrays of
    values. 
  - Fixed typo bug in hpic_convert when dealing with full-sphere files 
  - Fixed reading of cut-sphere files that don't have INDXSCHM and GRAIN
    but do use OBJECT=PARTIAL  
  - Make sure that the FITS routines always close the file when done
  - Improve configure script
  - Build shared as well as static libraries (libtool)
  - nsidecheck now returns error for NSIDE=0
  - Use the standard math constants (M_PI, M_1_PI, etc)

Version 0.47 (2004-09-21)

  - Fixed critical bug when converting row/col to angle.  Bug found
    by Nicholas Phillips.
  - Fixed error in ang2pix when column "wraps" back to zero
    in equatorial region.  Bug found by Giuseppe Vacanti.

Version 0.46 (2004-08-23)

  - Fixed typo bug in hpic_2ascii 
  - Read optional FITS keys from primary header, as well as extension 
    header.  Writing is still only supported to the extension header.
  - Vector data is now realloced in chunks of size HPIC_VECBUF. 
    Hopefully this will speed up vector resizing, since a realloc is
    not required for every resize.
  - Fixed bug in hpic_scale (writing to output file failed)

Version 0.45 (2004-08-17)

  - Integrated Perl wrapper code
  - Documentation up to date
  - Fixed bugs
  - Added CHEALPix compatibility wrappers
  - Added hpic_scale command line utility
  - Added map and vector array structs
  - Started adding tree code (currently disabled)

Version 0.42 (2004-06-08)

  - Rewrote much of the FITS subsystem.  It now supports all known
    healpix style FITS formats.
  - Added hpic_keys class to easily handle FITS keys
  - Added CMB specific FITS wrappers

Version 0.40 (2004-04-03)
  
  - First release to friends.
  - Many things still need work (documentation, etc)
  - All implemented functions should work except in-place order 
    conversion