Fix 1986252: double "Blech! You need xy!" message

Fix 1966204: make non-amphibious undead capable of drowning or the equivalent thereof

When you see a weapon with the returning ego return (to you or a monster) set the properties known along with the brand (because artefacts can't be id'd by throwing alone, anyway). This helps alleviate BR 1958616, but doesn't solve the problem with the curse status being unknown.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5499 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 6, 2008
32PXX2XJVV7YSLLYNAVS7RYKYRAOQ565TZMTITSEPSSXOYPB5M2AC
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