Try to place monsters in a wider radius around the chosen square, fixes arena not being able to create large numbers of monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8168 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 3, 2009
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