0020676: EDF 1212 GEOM: Partition operation creates vertices which causes mesh comput...

0020676: EDF 1212 GEOM: Partition operation creates vertices which causes mesh computation to fail with netgen

-  TopoDS_Shape GetSubShape() const  { return myShape; }
+  const TopoDS_Shape& GetSubShape() const  { return myShape; }

+typedef SMDS_Iterator<const TopoDS_Shape*>  PShapeIterator;
+typedef boost::shared_ptr< PShapeIterator > PShapeIteratorPtr;

+  /*!
+   * \brief Return iterator on ancestors of the given type
+   */
+  static PShapeIteratorPtr GetAncestors(const TopoDS_Shape& shape,
+                                        const SMESH_Mesh&   mesh,
+                                        TopAbs_ShapeEnum    ancestorType);