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XVista9H: 2/23/2003   Michael Richmond (mwrsps@rit.edu)

  DESCRIPTION:
    Eighth Alpha release of XVista.  Has Makefile flags appropriate for
    Linux and SunOs 5.5.  Very few regression tests, and the tests
    aren't invoked by the Makefile.  All documentation in Unix "man"
    format. 

  NEW to this release: 
    - new program "back" can fit low-order polynomial to image
         and subtract it (if desired)
    - moved the "find_sky" routine from "sky.c" to its own source code
         file "findsky.c", and added it to the library so that other
         programs can call it
    - added some #include lines to most source code files so that
         compiler warnings disappear

  TODO for future releases: 
    - improve Makefile, perhaps adding a short Configuration script
    - convert some (all?) documentation to HTML
    - add many more regression tests, and a test target in Makefile
    - modify code to place as few restrictions as possible on graphics;
       that is, allow users without X Windows to compile, link and run
       as many of the programs as possible
    - get rid of the "PROTO" cpp macro, making all code use prototypes
    - fix programs so that if given an unknown argument, 
       they print error message and _quit_
    - fix some programs so that, if given argument which isn't a valid image,
       they print error message and quit gracefully;
       some programs (such as 'tv') currently dump core.