Add a few new tiles, one the exclusion centre (I can't be the only one

who has trouble to remove an exclusion because I can't find its centre) and four additional blood variations. They are all rather similar to the up to now only one - too similar, perhaps. In any case, those areas of bloodsoaked battlefields (such as you'll encounter in the Abyss or Pandemonium) look a bit more interesting now. The way the variant is chosen is unfortunately rather hacky, and might lead to unexpected patterns.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6176 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 27, 2008
EQNA77UM24FFYQ2N44FG53KQGLS43ZGEX7XS5UWR6MM2HE3JBKAAC
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