Added a "flatten -doproperty" command option that allows selective

flattening based on cells which have a property "flatten".  Also:
Modified the DEF read and write to convert DIEAREA into a
FIXED_BBOX property.  This solves issues with placing of components
from DEF, when those components may not have have come from place &
route and may not have P&R bounding boxes.  Also:  Fixed the
documentation for the "dump" command, which was missing the optional
orientation in the description.

database/DBcellsubr.c

@@ -64,6 +64,8 @@ DBDescendSubcell(use, xMask)
     CellUse *use;
     unsigned int xMask;
 {
+    bool propfound;
+
     /* Check single bit (window ID) or zero */
     if (((xMask - 1) & xMask) == 0)
 	return ((use->cu_expandMask & xMask) == xMask);
@@ -91,6 +93,16 @@ DBDescendSubcell(use, xMask)
 	case CU_DESCEND_NO_VENDOR:
 	    return (use->cu_def->cd_flags & CDVENDORGDS) ? FALSE : TRUE;
 
+	case CU_DESCEND_PROP_FLAT:
+	    if (use->cu_expandMask == CU_DESCEND_SPECIAL)
+		return TRUE;
+	    else
+	    {
+		/* Descend only into cells marked with property "flatten" */
+		DBPropGet(use->cu_def, "flatten", &propfound);
+		return (propfound) ? TRUE : FALSE;
+	    }
+
 	case CU_DESCEND_NONE:
 	    return FALSE;
     }