Take advantage of check_redraw() generating an AI_SEE_MONSTER interrupt when

appropriate, and fix dispersal ammo's usage of apply_location_effects() and check_redraw().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8582 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 19, 2009
LXVO45D6K6HCT2LOHMCQIT76VFKX6OFQOQSUAEHR3U32G43TPEBQC
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