Modified the cell clear routine so that it removes properties in

addition to subcells, paint, and labels.  Otherwise problems arise
if a cell is read from LEF followed by GDS;  the GDS view overwrites
the LEF but the property "LEFview" remains and causes problems when
writing GDS output subsequently.

database/DBcellsubr.c

@@ -157,7 +157,8 @@ dbCopyDefFunc(tile, def)
  * DBCellClearDef --
  *
  * Empties out all tile planes of the indicated CellDef, making it
- * as though the def had been newly allocated.
+ * as though the def had been newly allocated.  This also removes all
+ * labels and all properties from the cell.
  *
  * Results:
  *	None.
@@ -221,6 +222,10 @@ DBCellClearDef(cellDef)
 	freeMagic((char *) lab);
     cellDef->cd_labels = (Label *) NULL;
     cellDef->cd_lastLabel = (Label *) NULL;
+
+    /* Remove all defined properties */
+    DBPropClearAll(cellDef);
+
     SigEnableInterrupts();
 }