Clean up is_evil_weapon() some more, and handle the rest of the evil

fixedarts.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3492 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 29, 2008
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