Add various beam explosion-related cleanups. Also, make cleansing flame

an explosion of BEAM_HOLY around the player instead of an aimable effect.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8467 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 15, 2009
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