Disallow vampires from draining summoned creatures to be consistent with

summoned creatures being incapable of bleeding on the floor. This makes things more difficult for Vampires; on the other hand there was a (more or less) recent change that lets them regain 1 hp per turn when draining corpses. We might also increase the duration of blood potions…

Apart from that, various clean-ups.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6393 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 4, 2008
4FQAKUKUO6PCAZ3N4HUR5XL6E4VA5UQUZ3AEDGRBLVY7W2LMWI7QC
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