Take good neutrals into account when checking if a monster's enemies are

around, and have a monster leaving the level cast spells like a fleeing monster, for the sake of getting out of the way.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5936 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 18, 2008
2YK255CF5YJ3LZTKOI633NJSVM63HFB3MAIYDV7ZJDCC5SWQIO6AC
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