Rebase 'rnv/sphinx_doc' branch on the top of the 'master' branch.

diff --cc src/SMESH_SWIG/smeshBuilder.py
index f4f48a1a089049405fb0fb22e8f7d0fb2f3b50af,0553145f3d457366be88f457aea35ac9583252f5..78f85f93c996d51cae7904bb82d063ce44896281
--- 1/src/SMESH_SWIG/smeshBuilder.py
--- 2/src/SMESH_SWIG/smeshBuilder.py
+++ b/src/SMESH_SWIG/smeshBuilder.py
@@@ -1354,18 -1354,6 +1354,22 @@@ class smeshBuilder(object, SMESH._objre
          aMeasurements.UnRegister()
          return value
  
-     ## Get gravity center of all nodes of the mesh object.
-     #  @param obj mesh, submesh or group
-     #  @return three components of the gravity center: x,y,z
-     #  @ingroup l1_measurements
 +    def GetGravityCenter(self, obj):
++    """
++    Get gravity center of all nodes of the mesh object.
++        
++    Parameters:            
++        obj: mesh, submesh or group
++    Returns:        
++        Three components of the gravity center: x,y,z
++    """
 +        if isinstance(obj, Mesh): obj = obj.mesh
 +        if isinstance(obj, Mesh_Algorithm): obj = obj.GetSubMesh()
 +        aMeasurements = self.CreateMeasurements()
 +        pointStruct = aMeasurements.GravityCenter(obj)
 +        aMeasurements.UnRegister()
 +        return pointStruct.x, pointStruct.y, pointStruct.z
 +
      pass # end of class smeshBuilder
  
  import omniORB
@@@ -6443,37 -6431,6 +6447,37 @@@ class Mesh
        """
          return self.editor.CreateHoleSkin( radius, theShape, groupName, theNodesCoords )
  
-             segments - PolySegment's defining positions of cutting planes.
-             groupName - optional name of a group where created mesh segments will
 +    def MakePolyLine(self, segments, groupName='', isPreview=False ):
 +        """    
 +        Create a polyline consisting of 1D mesh elements each lying on a 2D element of
 +        the initial mesh. Positions of new nodes are found by cutting the mesh by the
 +        plane passing through pairs of points specified by each PolySegment structure.
 +        If there are several paths connecting a pair of points, the shortest path is
 +        selected by the module. Position of the cutting plane is defined by the two
 +        points and an optional vector lying on the plane specified by a PolySegment.
 +        By default the vector is defined by Mesh module as following. A middle point
 +        of the two given points is computed. The middle point is projected to the mesh.
 +        The vector goes from the middle point to the projection point. In case of planar
 +        mesh, the vector is normal to the mesh.
 +
 +      Parameters:        
++            segments: PolySegment's defining positions of cutting planes.
++            groupName: optional name of a group where created mesh segments will
 +            be added.
 +            
 +        Returns:    
 +            The used vector which goes from the middle point to its projection.
 +      """    
 +        editor = self.editor
 +        if isPreview:
 +            editor = self.mesh.GetMeshEditPreviewer()
 +        segmentsRes = editor.MakePolyLine( segments, groupName )
 +        for i, seg in enumerate( segmentsRes ):
 +            segments[i].vector = seg.vector
 +        if isPreview:
 +            return editor.GetPreviewData()
 +        return None        
 +
      def GetFunctor(self, funcType ):
          """
          Return a cached numerical functor by its type.