Restrict DrMo, unrestrict DrFE and DrIE. Disallow the creation of caps

for Gladiators - species who can't wear helmets just don't get them now. Uncomment debugging option in monster placement. However useful (and necessary) it may be at the moment, it has no place in trunk.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6389 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 4, 2008
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