Improve handling of monsters leaving the level again: they all get

messages when visible now.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6014 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 20, 2008
FXK7Y2F4YJE422WMQ6TYHONWVVDRWLWCU47BXHXCR53DHF6YC76AC
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