In debug_mons_scan() if a monster is floating because another monster is

also on the same square then print a warning message about it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7633 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on November 26, 2008
DCJFH6FQ5VED5NEBORB733QHJOWOWBQR4C5STNXYQKORXX23UCWAC
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