Aug 1990, Marc Unangst: 
	original version

Aug 1994, Thomas McWilliams: 
	added much faster conversion algorithm.
	for speed, changed 'c' parameter from char to int in rotate().
	for speed, changed return value of rotate() to int.
	added INLINE macro for compilers which support inline.
	added check for __GNUC__
	added man page rot13.1, Makefile, COPYING, INSTALL, Changelog
	added perror() error reporting.
	removed redundant code.  

