Don't allow very long entry vaults to be rotated, because they cut off parts of

the level.

We should also add sanity checks to make sure at least one downstair is reachable from the start position, or that the entry vault is fully-enclosed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@920 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on February 5, 2007
7SRBOZTHIAHOTG3TZGFUA7CEZ7PU5TAAU3TGQA6U7XWKC4E2UFOAC
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