Mesh_3 - add return code

[janetournois]

Issue Details

It would be nice if CGAL::make_mesh_3() returned a "return code" to known whether the edge_min_size, facet_min_size or cell_min_size criteria had been used. If so, the output mesh is likely to not satisfy the other meshing criteria and it would be nice to be able to know it without checking a posteriori the output mesh.

[afabri]

Return code, or more named parameters, or as part of the Visitor API ?

[janetournois]

It could stand in a named parameter, similar to mesh_3_dump().

Knowing that a min-size bound has stopped the algorithm from over-refinement, or that all refinement criteria are actually met, would be interesting