Additional changes; fixed some of the most problematic issues

involving searches on split tile areas, including one very
important check for interaction between split tiles during
hierarchical extraction.  There is still something wrong in
the hierarchical extraction, but it could be the last remaining
issue.

extract/ExtSubtree.c

@@ -1100,7 +1100,7 @@ extSubtreeTileToNode(tp, dinfo, pNum, et, ha, doHard)
 	    {
 		if (DBSrPaintNMArea((Tile *) NULL,
 			et->et_lookNames->cd_planes[pNum],
-			TiGetTypeExact(tp), &r, &DBAllButSpaceBits,
+			dinfo, &r, &DBAllButSpaceBits,
 			extConnFindFunc, (ClientData) &reg))
 		{
 		    if (SigInterruptPending)