check whether the map's submap grid

is somehow corrupted,
before adding a spawn point to it.
fixed segfault on flooding strange temple room
Let webs be woven over slime.

Both web weaver and slimy are mutations that can coexist.
Merge remote-tracking branch 'zpmorgan/master' into for-darklingwolf
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf
Un-macro iterating across the skills vector.
Greatly reduce the transmission of scent across closed doors, windows, etc.
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf