Since the M_THICK_SKIN flag has no effect, replace it with the

M_STATIONARY flag, and mark stationary monsters with it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4553 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 23, 2008
ABYG7KPBG5FZFQQB5QYJKZCEDJLQBJDBS6KAV2ZFKQU5QY4WDGWQC
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