Add TsumoPossibilityTest more.
Tweak book.
Calculates necessary puyos to fire a rensa.

Instead of using the puyos for key puyo or to fire rensa,
we'd like to calculate how many puyos are necessary to fill
key puyos or to fire rensa, since this is more accurate.

For example, getting 3 red puyos needs more puyos than getting
2 red puyos and 2 green puyos (possibility=50%).