Finds the given point in the profile, or adds it in sorted z order.

def _get_point(self, profile, point):
        """
        Finds the given point in the profile, or adds it in sorted z order.
        """
        cur_points_z = [p.location.z for p in profile.elements]
        try:
            cur_idx = cur_points_z.index(point.z)
            return profile.elements[cur_idx]
        except ValueError:
            new_idx = bisect_left(cur_points_z, point.z)
            new_point = Point()
            new_point.location = sPoint(point)
            new_point.time = profile.time
            profile.elements.insert(new_idx, new_point)
            return new_point