0022108: EDF 2547 SMESH: Duplicate elements only

+    def DoubleElements(self, theElements, theGroupName=""):

src/SMESH_SWIG/smeshBuilder.py

@@ -4133,12 +4133,30 @@ class Mesh:
     def GetLastCreatedElems(self):
         return self.editor.GetLastCreatedElems()
 
-    ## Clear sequences of nodes and elements created by mesh edition oparations
+    ## Clears sequences of nodes and elements created by mesh edition oparations
     #  @ingroup l1_auxiliary
     def ClearLastCreated(self):
         self.editor.ClearLastCreated()
 
-     ## Creates a hole in a mesh by doubling the nodes of some particular elements
+    ## Creates Duplicates given elements, i.e. creates new elements based on the 
+    #  same nodes as the given ones.
+    #  @param theElements - container of elements to duplicate. It can be a Mesh,
+    #         sub-mesh, group, filter or a list of element IDs.
+    # @param theGroupName - a name of group to contain the generated elements.
+    #                    If a group with such a name already exists, the new elements
+    #                    are added to the existng group, else a new group is created.
+    #                    If \a theGroupName is empty, new elements are not added 
+    #                    in any group.
+    # @return a group where the new elements are added. None if theGroupName == "".
+    #  @ingroup l2_modif_edit
+    def DoubleElements(self, theElements, theGroupName=""):
+        if isinstance( theElements, Mesh ):
+            theElements = theElements.mesh
+        elif isinstance( theElements, list ):
+            theElements = self.GetIDSource( theElements, SMESH.ALL )
+        return self.editor.DoubleElements(theElements, theGroupName)
+
+    ## Creates a hole in a mesh by doubling the nodes of some particular elements
     #  @param theNodes identifiers of nodes to be doubled
     #  @param theModifiedElems identifiers of elements to be updated by the new (doubled)
     #         nodes. If list of element identifiers is empty then nodes are doubled but