Adding naga and centaur barding tiles to replace bad placeholder art.

Removing more unused Nethack tiles.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3220 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 7, 2008
HRAL36C7UUL7V6TFXQ76FZ3VVVFEJYF7YWOP2EXYXP6C27XME2PAC
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