it should now be possible to play a game by entering both players'
moves at the terminal (compile and run server.c).
moves are entered as follows:
M E9 S # move piece at E9 south
M D5 NW # move piece at D5 north-west
R D5 R # rotate piece at D5 clockwise ('right')
R D5 L # rotate piece at D5 counterclockwise ('left')
the ASCII display should be quite self-explanatory -- or at least, by
applying lots of creativity, _possible_ to read.
