- changed dynamic light traversal to use sections instead of the subsectors.

This is mostly complete, except for handling intra-section sidedefs.

src/r_utility.cpp

@@ -142,6 +142,7 @@ bool			setsizeneeded;
 
 unsigned int	R_OldBlend = ~0;
 int 			validcount = 1; 	// increment every time a check is made
+int 			dl_validcount = 1; 	// increment every time a check is made
 FCanvasTextureInfo *FCanvasTextureInfo::List;
 
 DVector3a view;