Add more pathfinding improvements for monsters leaving the level.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6039 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 21, 2008
JME76OR4ZNGHYVDVQ6ZT7FCB4UMG4V3RVMTQJQNQRRR66KARJHLQC
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