Change status to done when game is finished

Count the number of marks. Check if the board is in a complete
configuration once the same number of marked tiles is the same as the
number of flowers, and change the status line accordingly. Otherwise
mark the game as over.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>
Disable tiles when game is finished

Tiles are not disabled when the game is finished successfully. This
means that even if the game was won the user can continue and eventually
loose. Always disable tiles when the game is over. A new game has to be
initiated if the user wants to continue.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>