Added MAP_GRID_KNOWN to represent a map square that needs to be drawn on the

level map, refixed DC fix.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1262 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on April 7, 2007
JI3OY2BNOZWJ5RQGQJTIJ2X2NUURL6YI2L5OVUAL3CSNEWAQW6VQC
Change contents