code: def setOverlayNeighbor(self, eDirection, ulFrom, ulTo):
          
  
          fn = self.function_table.setOverlayNeighbor
          result = fn(eDirection, ulFrom, ulTo)
          return result
docs: Sets an overlay's neighbor. This will also set the neighbor of the "to" overlay
          to point back to the "from" overlay. If an overlay's neighbor is set to invalid both
          ends will be cleared