* in multiplayer games, you may view the opponent's
playfield (choose which opponent with the TAB key)
* players may choose the classic dropset (only pairs of puyos) in
sandbox mode and multiplayer games
* players may change the speed of the game in sandbox mode
* puyo rotations may move the puyo up but only just enough
* there is only one usable invisible line, puyos on top of it are
deleted
* ESC key may be used to quit online mode in login screens
* random puyo generator is a little less random and more friendly
* in multiplayer games, all players have the same random puyos
* option ALPHA in ~/.furypuyo/furypuyo.cfg allows you to disable
alpha transparency (game becomes ugly but runs faster)
