Merges points based on time/location.

        @TODO: move to paegan, SO SLOW

def _merge_points(self, pc1, pc2):
        """
        Merges points based on time/location.

        @TODO: move to paegan, SO SLOW
        """
        res = pc1[:]

        for p in pc2:
            for sp in res:
                if sp.time == p.time and (
                    sp.location is None or (sp.location.equals(p.location))
                ):
                    sp.members.extend(p.members)
                    break
            else:
                res.append(p)

        return res