OpenLayers.MouseListener.EditingListener.AddPathPoint

  This mouseListener allows user to add points to the path of a geometry in a vector layer feature

* Constructor
  OpenLayers.MouseListener.EditingListener.AddPathPoint() -- Creates a new control. No options available.

* Methods
  initialize -- none -- Constructor
  mouseDblClick -- none -- Erase all the temporaries elements and finalize the drawn geometry
  mouseDown -- none -- if user click close (distance lower than map.snappingTolerance) to a geometry segment on a current vector layer feature, a new vertex is added
  mouseMove -- none -- if the user is drawing a geometry, a temporary segment is drawn to visualize what the geometry should be.
  keyDown -- none -- on RETURN key event, the geometry is finalized and on ESC key event, the geometry is cancelled
  _finalizeGeometry -- none -- internal method to add a new feature to the vector layer
  _eraseTmpElements -- none -- internal method to erase all the temporaries elements
  All other methods are inherited from {OpenLayers.MouseListener.EditingListener}