Grey out all monsters and cells (not just wall cells) out of range.

Describe out-of-range monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7145 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on October 5, 2008
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