a new concept of point, that stores:
- the lowest dimension of all psc elements that contain it,
- the index of the psc elements of lowest dimension that contains it.
Two files:
include/CGAL/Point_with_psc_localisation.h
include/CGAL/Weighted_point_with_psc_localisation.h
with bvious names: one is for Delaunay triangulations, and the other is for
regular triangulations.