[1612448] Allow polearm users to attack monster submerged in shallow water.

Need to update the AI so the monster either flees or unsubmerges and fights.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1501 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on June 1, 2007
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