Added rock worm and transparent wall tiles from Denzi.

Added blood splatter. More tile code cleanup.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3304 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 19, 2008
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