Changes since 2.21:

o  Refactored curses terminal calls into own module
o  Many autoconf changes with the hope to improve portability and
   likely just breaking things
o  New diskdef for HP200
o  Added dirblks to allow reserving blocks after the directory
   as used by Kaypro
o  Fixed user number output for cpmls -d
o  Added option -u to show all CP/M file names in uppercase
