Implemented dispel undead for monsters.

Cold resistance was broken, fixed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3349 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 27, 2008
UW4XQAAAV3S2ZVBLMSK6VQG6AMYR6DRKXFP64HHBC6Z3QIUWPVXQC
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