Fix specific references to vampires versus generic references to

semi-undead. The latter are now only used for determining the following: whether the player can mutate, whether the player can rot, and how much the player resists Dispel Undead.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4621 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 25, 2008
FFHV7U5Z42CKIQQDFZB2LBFDTBEQKS5TL3376CJKGAIY4RNMJVNAC
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