make player::has_claws() return an int indicating the level of claws

available; this removes the need for some special cases dealing with trolls' and ghouls' built-in claws

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2890 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on November 21, 2007
DTMAROHP75MUCSQHYEAL3K6OUZCXDUJK7SKCFY4JSKJRENHDPTIQC
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