Ooops, wasn't actually prompting player for weapon swap if butchery was

interrupted by a monster coming into view.

Also, give "monster comes into view" warning message if butchery is interrupted.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7718 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 2, 2008
3YAWEKEQ7P2OL2X3H53DHI7IMAKH6GDQ7NE5GBNYN7O64L3NEDSAC
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