Clean up gourmand-related routines: only check for gourmand duration

instead of checking for wearing the amulet and gourmand duration, account for gourmand (both the amulet and the mutation) in the output screen, and treat gourmand (both the amulet and the mutation) consistently with regard to potions of blood.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9153 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 22, 2009
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