Minor dungeon fixes. Encompass maps were erroneously being vetoed. Octagon rooms no longer have a hideous discontinuity on their lower right corner. Octagon rooms are also no longer always smeared.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6687 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on July 25, 2008
6ZQY6HMQHBIQP6RPQZTK4KJ6YGCW2SJJUYHGI6UVATES5GKJRP7QC
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