Implemented 169876 - you now check nonadjacent squares for traps

even without 's'; lowered the random chance to succeed to compensate. Needs balance testing.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1318 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 15, 2007
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