make player::has_claws() and player::has_usable_claws() take a bool

indicating whether claws from transformations should be taken into account; this removes the need for more special cases dealing with trolls' and ghouls' built-in claws

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2891 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on November 21, 2007
NF5ISJJGD3UIZYQHYM6LC726BBBMZBCFQ2HWDDXWY2NQQKH6JN4AC
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