Add instructions for doing a release

Add instructions for doing a release
clean up .spec file; perhaps this will be useful to somebody...
Update to 2.2.93
Make 'scanopen' static so GCC doesn't whine about lacking prototype
Add WARN_CFLAGS to pass -W flags for GCC systems
Change various char types around to match across function calls. Fixed bug
    in using available_sizes[i].height which is in pixels, not 64ths of a
    pixel.