More neutrality cleanups. Holy beings neutralized on sight by your

piety will not attack you and can swap positions with you. All other neutral beings behave the same as before.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4119 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 7, 2008
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