6.0

** added GNU software compliant files
** now handle hierarchical keywords
** added tcl wrapper to I/O routines
** added python wrapper to I/O routines
** version number set by autoconf
** added wcslib-3.6

6.1

** updated cfitsio version to 2.5

6.1a

** configure now admits --enable-midas or --disable-midas options
** added function last_char_before

