Add more consistency fixes for equipment. Disallow dwarven needles and

blowguns in set_equip_race(), as the former are useless without the latter, and dwarves don't make the former. Also, disallow racial naga and centaur bardings, as they aren't generated randomly, and are useless to anyone but nagas and centaurs. Finally, allow orcish robes and shields to be generated randomly; among monsters, orc wizards already get orcish robes, and, among players, orc fighters already start with orcish shields, and orcs are good with shields anyway.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3032 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 9, 2007
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