Branch entry vaults now respect DEPTH: declarations so you can put tough branch entries deeper.

Detect creatures no longer clears the level map of detected items.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1366 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on April 25, 2007
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