SOURCE FILES of /lib/io directory :

- iolib.c    : set of macros handling access to MIDAS, IRAF annd FITS structures
- io_utils.c : set of utils macros for io
- io_error.c : set of macros to handle errors

description of sub-directories :

fits_io  : basic interfaces for FITS i/o
iraf_io  : basic interfaces for IRAF/STSDAS i/o
midas_io : basic interfaces for MIDAS i/o

