Implement FR 1911470: DVORP type influences chance of spattering blood

This is currently purely cosmetical, but there are a lot of ideas out there how to make blood have an effect.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3910 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 28, 2008
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