code: def delete(self, tag, ref):
          
  
          _checkErr('delete', _C.Vdeletetagref(self._id, tag, ref),
                    "error deleting member")
docs: Delete from the vgroup the member identified by its tag
          and reference number.
  
          Args::
  
            tag    tag of the member to delete
            ref    reference number of the member to delete
  
          Returns::
  
            None
  
          Only the link of the member with the vgroup is deleted.
          The member object is not deleted.
  
          C library equivalent : Vdeletatagref