Move a bit more things to use coord_defs and iterators instead of x,y.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8892 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 4, 2009
JZNN5MYGLJ2N5VOKJU54ROMBUZPQXGGLAKR7GFH3VCCEI65TFAFAC
Change contents