- [+] instead of evasion skill giving a fixed boost, make it change the
evasion bonus due to xp level.
* [+] give monsters free moves when you go back onto a level, BEFORE
placing the player.
- [+] fix dungeon code to eliminate nonlinked rooms
- [+] force all vaults to be at least 3 squares away from map edges
* [+] implement flood-fill test.