- dual functions in Delaunay class fixed (but code should still be improved)
- examples and demos modified accordingly
- broken: Hyperbolic_random_points_in_disc_2 and benchmarks (problems with number types)
changed invisible to non_hyperbolic
changed is_infinite to non_hyperbolic when needed
(is_infinite is still kept for compatibility with Triangulation_2 demo, which is reused)
changed Finite_faces/edges_iterators to Hyperbolic_faces/edges_iterators
(Finite* also kept for demo)
and example modified to allow deterministic testing