Clean up vampire biting attack, and call the new method whenever a

vampire successfully stabs one of those walking blood replenishers.

All in all, vampires will bite monsters that don't yield blood less often (1/3 chance), though their overall biting chance has been slightly increases, and much so when stabbing. Weapons of vampiricism are now a distinct case, so vampiric biting (that also is signified by SPWPN_VAMPIRICISM, occasionally) consistently doesn't check for life protection (though that might be added) and instead always respects the mons_has_blood checks.

Also, food messages ("You are very hungry.") are now displayed in green if your food level has increased.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3904 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 27, 2008
2WVP47RBNL5OVYMAZH7TKRYD7F2TGSZ5X74PWVGAYCQP26G3JUHQC
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