Enhancement/drop deprecated to_PointShapefile
This drops Tie_Point_Grid.Tie_Point_Grid._to_PointShapefile() which was replaced by Tie_Point_Grid.Tie_Point_Grid.to_PointShapefile().
This drops Tie_Point_Grid.Tie_Point_Grid._to_PointShapefile() which was replaced by Tie_Point_Grid.Tie_Point_Grid.to_PointShapefile().