Updated portal vaults (David).

Fixed dungeon.cc's handling of 1x1 vaults.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@953 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on February 15, 2007
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