This is attempt python3 "final" porting the game
by means of additional patches to initial py3 port.
The game is playable for me at "single player + 3 bots".
Network game process is not tested.
Menu icon for desktop entry is fetched from Kmahjongg project.
Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>
