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.

* Methods
  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
  mouseUp -- none -- when mouse is up update the feature modified into its layer
  mouseOver -- none -- calls the movePathPoint mouseOver method
  All other methods are inherited from {OpenLayers.MouseListener.EditingListener}
  
* Options
  deleteConfirmMessage -- none -- Message display to ask for features deletion confirmation, if set, called when user selected feature and presses suppr key on keyboard