Add a neutral monster brand (defaulting to darkgrey).

Of course we still need something like this for Tiles!

Make Ctrl+Dir call close_door() if the square in question is a closed door. I've tested it, and found this change (suggested by dpeg) extremely convenient. Also fixed the information leak about an invisible monster blocking a doorway without time passing.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3778 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 20, 2008
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