Massive overhaul to move towards coord_def().

This might have introduced some bugs: I now get intermittent crashes on startup (this might have to do with the changes to special_room.) Sorry about that - committing before I need to do any more big conflict resolutions. Fixes coming later.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6732 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on July 30, 2008
SIDH2P7NBIG5KEOE27XHD3ZT2NQ2OJZFN6VZXWNWYFFY5YVXSSVQC
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