TODO
Possible Improvements for future releases are
- BINARY mode not working! See prepared tests in Polynomial-test.C.
1) introduce CGAL number type traits and remove
ring_or_field from RPolynomial popping up in
Extended_homogeneous and Extended_cartesian
2) transfer plane map to Lutz's new HDS/Topological Map
mainly deferred by MSVC limitations
3) transfer extended kernel traits classes to functor design
this has deep impact in many algorithmic modules.