- Remove old file of Data_structure_using_octree
  -- Laurent Rineau 2006/02/23

- Verify that FT can be from an exact kernel...
- Make depends for applications/makefile
  -- Laurent Rineau, 2005/11/14

- add an assertion in compute_critical_radius() of Sliver_exuder.h
- clean global functions in include/CGAL/Mesh_3/Sliver_exuder.h
- clean include/CGAL/IO/File_medit.h Surface_mesher/include/CGAL/IO/
  and include/CGAL/IO.h
  -- Laurent Rineau, 2005/11/09

 - error messages, if reading file does not work, in applications/
 - add a "writing..." in combined_spheres.C
  -- Laurent Rineau, 2005/11/04

      - examples/Mesh_3/polyhedral_surface_mesher.C is broken because:
        - output_pslg_to_medit() in include/CGAL/IO/File_medit.h need
          surface_index() in points. :-(
        - Weighted_point wp = Weighted_point(p, best_weight, index);
          in include/CGAL/Mesh_3/Slivers_exuder.h
        - add_in_graph() & o in vertices (this sucks!)
        - should use Weighted_point_with_surface_index_geom_traits
      - test/Mesh_3/multi_spheres.C is broken because 
          ../../../Surface_mesher/ \
                  include/CGAL/Surface_mesher/Oracles/Multi_implicit_oracle.h
        *is* broken.
      - File_medit.h should not require systematicaly surface_index()
[DONE]- provide .cin files for tests (read Dev'Manual)
[DONE]- remove info()s everywhere
          Mesh_3/include/CGAL/Implicit_surfaces_mesher_3.h
          Mesh_3/include/CGAL/Mesh_3/Facet_on_surface_criterion.h
          Mesh_3/include/CGAL/Mesh_3/Implicit_surface_mesher_visitor.h
          Mesh_3/include/CGAL/Mesh_3/Refine_tets.h
          Mesh_3/include/CGAL/Mesh_3/Slivers_exuder.h

  -- Laurent Rineau, 2005/10/02


Sliver_exuder.h should contain only functions, I think.
  -- Laurent Rineau, 2005/04/06

include/CGAL/Mesh_3/ should only contain private files, but examples .C
   files use some of them.
Renommer Mesh_3::Complex_2_in_triangulation_cell_base_3 parce qu'il
   est très moche!!
Est-ce que les visiteurs doivent etre chaines par des pointeurs ou
   des ref?
  -- Laurent Rineau, 2050/05/10

As for potential robustess problems, in Sliver_exuder...
  Problems come from compute_critical_squared_radius, that is a constructor.
  cricical radii are compared.

  Perhaps should be templatize Sliver_exuder with two traits, like
  Filtered_kernel: an exact one, and an inexact one, as well as a
  converter.

  With meta-programming, we could provide defaults:
    - for Tr whose traits is a Filtered_kernel, use it
    - defaults: use the same traits classes.

  Then, in Slivers_exuder, the prestart could save exact
  squared_radii.

  -- Laurent Rineau, 2005/05/21