changes some iterator names in Triangulation_default_data_structure_2
some typenames (to avoid clahes) in Triangulation_face_2 and
Triangulation_vertex_2.h
added CGAL_TYPENAME_MSVC_NULL in Triangulation_iterators_2.h
to f->mirror_index(int i), f->mirror_vertex(int i)
add new functionalities to Tds and Triangulation :
Face_handle add_face(Face_handle f1, int i1,
Face_handle f2, int i2,
Face_handle f3, int i3);
Face_handle add_face(Face_handle f1, int i1,
Face_handle f2, int i2);
Face_handle add_face(Face_handle f, int i, Vertex_handle v);
And change the code of remove_2D() in Triangulation_2.h
and Delaunay_triangulation_2.h
Incoporate some of the changes made in Dagsthul
to compile with VC++