Fix Shoal:5 not being generated.

Reinstate the distinction between minivaults and regular vaults when placing maps based on PLACE:, because minivaults cannot be placed before the rest of the level is built.

Change Shoal huts to be picked by tag instead of PLACE.

Allow DEPTH: to use branch:$.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10591 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 21, 2009
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