Extend Enne's blood potion destruction fix to potions on the floor.

Fix monsters "upgrading" their ammunition even if its brand cancels out with the launcher. Also make sure monsters aren't generated with launcher/ammo with opposing brands. Fix 2021310: no longer disallow blowgun acquirement.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6601 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 18, 2008
VCQYSNAWZZHOZMARWQ4AJBDNFSS7T7CZBQISSPZ2YIIK5PVAWPRQC
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