Use minimal meshpolyhedron in 3D

[Benjamin Dam Kehlet]

We currently use the default mesh polyhedron: http://doc.cgal.org/latest/Mesh_3/classCGAL_1_1Mesh__polyhedron__3.html which is list based.

It should be possible to implement mesh polyhedron which can be used to construct a CGAL::Polyhedral_Mesh_Domain_3, but is as minimal as possible, probably using std::vector to store data

This reduce the memory usage, probably speed up queries and is likely improve the cache friendliness.