Changes from version 0.2 to 0.3 (1999-01-18)
-------------------------------

- Created abstract base class "Player_Creator" for registering new
  player types. Created class "Player_Types" used by the "othello"
  class to gain knowledge about what player types have been
  registered.

- Miscellaneous cleanups to remove compiler warnings.

- The program no longer locks up when one player has no valid moves,
  and therefore has to pass his turn.

- Added a new AI type player. The player uses the alpha-beta algoritm
  and plays a decent game.

- Fixed Makefile to make it possible to compile the program even if
  gtk+ is installed in a non-standard place. (Useful if you don't have
  root access.)

- Made it possible for player types to run configuration code before
  the game starts, useful for example to set thinking time for a
  computer opponent.

- Added a network player type. This makes it possible to play against
  a remote program over a TCP/IP connection. (You can even chain
  several program instances together if you want to.)
