Implement [2489129]: Remove the maximum HP hack for zombified monsters

other than spectral things, and make them use the M_NO_REGEN flag instead. Also, make them unable to flee, in order to preserve previous behavior and fix [2482719].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8286 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 6, 2009
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