* simplify code of AABB_tree::First_intersection_traits
* change intersection(ray,triangle) and intersection(line,triangle):
returned object is now an empty object, a point or a segment
* remove do_intersect test from Intersection::operator() of
AABB_traits: intersection(ray,triangle) and
intersection(line,triangle) do it.
IMPORTANT THINGS
- We need to add Compute_squared_distance_3 (at least for Point_3, Point_3) to the traits requirements
- Since we use the (decorated) Traits as a template parameter for the Search_traits_3, we need to add
this as a requirement. Currently, the Search_traits_3 requests that the template parameter be a CGAL
kernel. This is much too strong!
Stéphane Tayeb
Pierre Alliez
Camille Wormser