Fixing Pan assertion.

Fixing Pan coloring issue. Adding new dungeon tiles from Denzi. Fixing lack of initialization of tiles when going up stairs to a new level. Allowing for different flavors of lava and water.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3199 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 5, 2008
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