Beams now get -2 to-hit for every smoke square they pass through.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1674 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on June 27, 2007
WA2OSEGWVCESURYWNERNYWQKHE6SU4XQ4Q4HJY5B6ZPGNFUKQEEQC
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