12.11.1999 Thanks to Claudio Fanin for testing and debugging under HP-UX 
           and SGI/MIPS
26.10.1999 Thanks to Sven Arnold for writing a patch that avoids troubles
           with old versions with mtools, corrects some typos and a bug that
           caused mfm to terminate when "select all" was called on an empty 
           floppy.
27.10.1999 Thanks to Thomas Ribbrock for finding a bug in a signal handler 
           and for giving me some ideas for the Makefile.
