0021893: EDF 2133 SMESH : Improvement of 3D extrusion algorithm

0021893: EDF 2133 SMESH : Improvement of 3D extrusion algorithm

+  static bool IsSameElemGeometry(const SMESHDS_SubMesh* smDS,
+                                 SMDSAbs_GeometryType   shape,
+                                 const bool             nullSubMeshRes = true);

+  static bool IsStructured( SMESH_subMesh* faceSM );

+  static int Count(const TopoDS_Shape&    shape,
+                   const TopAbs_ShapeEnum type,
+                   const bool             ignoreSame);

-  void SetElementsOnShape(bool toSet) { mySetElemOnShape = toSet; }
+  bool SetElementsOnShape(bool toSet)
+  { bool res = mySetElemOnShape; mySetElemOnShape = toSet; return res; }