Added a flag to disable generation of exits from a vault. Need to clean up vault placement to make it easier to parameterise it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2567 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on October 25, 2007
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