Add some checks to Xom making you cast spells, so you don't attempt to

e.g. cast a branding spell, or a transformation that will fail for whatever reason. You may still occasionally get a "The spell fizzled" (or whatever) message but that should be rarer now. Apply the same fail chances for Detect Items as for Magic Mapping for fully explored levels, and for low severity make Summon Butterflies more likely to avoid endless attempts of casting Magic Mapping on fully explored levels.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9573 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 31, 2009
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