Applying dolorous' latest patch (1806451), mostly

correcting typos in the comments and changing Xom stimulation from 256 to 255 (as the function apparently cannot handle that).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2384 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on October 8, 2007
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