Level-files are now saved with subdungeon depths rather than absolute depths.

Breaks save compatibility resoundingly. The advantage of the change is that ghosts dying in a branch will always be reloaded at the same depth in the branch.

Fixed minor bug that could result in branch stairs taking you to different places on successive visits.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1446 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on May 10, 2007
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