Removed obsolete "levels" option. des files to load should be specified in loadmaps.lua and nowhere else.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2663 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on October 29, 2007
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