[2026251] Fixed Elf:1 arrival sometimes being disconnected - the map used ORIENT: south, but defined no exits. Fixed by applying the old floating vault exit behaviour to all vaults (apart from minivaults) so explicit @ exits are now optional.

Also fixed maps being unable to place monsters on shallow water.

Added debug_mons_scan to scan the mgrd for stranded monsters in fulldebug mode.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6659 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 24, 2008
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