Display a message if the dungeon was expanded

[stephen]

Currently the game expands the dungeon size automatically if the quest is too big for the requested size. (For example if there are a large number of players then the dungeon might have to be expanded to fit everybody in. Also certain features e.g. gnome books or a guarded exit require a certain minimum dungeon size.)

If this happens, then a message should be printed at the start of the game, something like "Quest is too big for a Tiny dungeon. Expanding dungeon size to Small."

[stephen]

An alternative option would be to allow entry points to be shared, rather than expanding the dungeon size. This could get crazy with a lot of knights... so it should be an optional feature.

[stephen]

Didn't add entry point sharing; just added the warning message.