Allow full-level (encompass) vaults to be placed outside the main dungeon.

Fixed a bug where secondary vaults and minivaults could overwrite special rooms.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1834 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 11, 2007
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