Fix [2610764]: 5% of all misses gave 'Your armour prevents you

from hitting $MONSTER' regardless of armour. Also put in some paranoia to prevent this happening in the future.

The minimum chance of hitting a monster has been reduced from 1 - 0.95^2 = 9.75% (which was a bug) to 5% (which was the intention.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9123 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 18, 2009
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