Neutral monster adjustments: monsters made permanently neutral by Zin's

Recite will give half XP, a la Elyvilon; neutral monsters that have given half XP will not attack the player; and holy beings converted on sight by the player's piety will have the half XP flag set, even though they don't actually give it (on the grounds that they shouldn't be good kills if they turn hostile).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4086 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 6, 2008
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