Fix 2019873: Monsters picking up a second melee weapon if they already

have one. (They now either upgrade or simply ignore a second weapon, unless dual-wielding.)

Fix 2021307: Really get in some butchering before you get interrupted.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6604 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 18, 2008
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