Reset the points for the specified index position.  If no index is
        specified, reset points for all point handlers.

def reset(self, index=None):
        '''
        Reset the points for the specified index position.  If no index is
        specified, reset points for all point handlers.
        '''
        points_handler_count = len(self.registration_view.points)
        if index is None:
            indexes = range(points_handler_count)
        else:
            indexes = [index]

        indexes = [i for i in indexes if i < points_handler_count]

        for i in indexes:
            self.registration_view.points[i].reset()
        if indexes:
            self.registration_view.update_transform()