Before this patch, Construct_initial_points did not try to intersect with
the bounding polyhedron, but only with the other polyhedra. That can lead
to a crash if the given polyhedra are a bounding one, and a second
polyhedron that is coplanar. Then the initial points are *all* coplanar,
and then tr.dimension()==2 and an assertion is triggered.
Now Construct_initial_points uses construct_intersection_object(), and the
later tries to intersect with all polyhedra, including the bounding one.
* make_surface_index() of class Polyhedral_mesh_domain_3 is now public
* change default value of Min_dihedral_angle_criterion from 25 to 12
* add command-line applications for various mesh generation examples
* Minor fix in Polyhedral_mesh_domain_3: internal AABB kd-tree is now built
* Minor fix in mesh_standard_facet_criteria.h: check dimension with >2 instead of ==2 & add some assertions
* Add internal(undocumented) usefull genericity:
+ add Wrapper template parameter (with default value) in Implicit_mesh_domain_3
+ add Wrapper template parameter (with default value) in Labeled_Image_mesh_domain_3
+ add two template parameters (with defaults) in Mesh_criteria_3