Redid ray ordering a bit.

Fixed a bug when displaying rays (they were being offset by 1 on the X axis.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1033 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on March 13, 2007
BHG4L3FEW3UDCNBQ4GLEONTAKFIXTRFCLQ2BQ4YNPF3I6NRZXBGQC
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