Scroll of vulnerability shouldn't annoy friendlies.

Don't train stealth on unseen monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8747 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on January 25, 2009
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