Change butchering prompt to hopefully be less confusing (BR 2009022).

Also add a key to some kind of butchering help (may need tweaking) and 'b' is yet another synonym for 'c' but will allow Vampires to butcher a corpse they'd otherwise bottle. This only works while the prompt is given, i.e. if always_confirm_butcher is false Vampires will automatically attempt to bottle the blood in a single corpse (unless that is impossible, in which case they'll butcher it instead).

Also fix corpses sometimes not being destroyed when drained by a Vampire. (Big oops!)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6366 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 3, 2008
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