Checks whether the plane is identical to one of the Planes in the plane_list list of Planes
        :param plane_list: List of Planes to be compared to
        :return: True if the plane is in the list, False otherwise

def is_in_list(self, plane_list):
        """
        Checks whether the plane is identical to one of the Planes in the plane_list list of Planes
        :param plane_list: List of Planes to be compared to
        :return: True if the plane is in the list, False otherwise
        """
        for plane in plane_list:
            if self.is_same_plane_as(plane):
                return True
        return False