Robust Quotient with cpp_int

[danston]

This PR provides a benchmark that compares different exact number types available in CGAL and robustifies the new option that is Quotient<boost::multiprecision::cpp_int> by providing a better/faster version of the to_interval() function with tighter intervals.

The results of the benchmark are available here.

Currently, we have three different versions:

• one based on gmpzf (passes tests but not NEF benches)
• one based on boost (passes tests but not NEF benches)
• one based on cpp_rational (stable, works for all benches / tests)

TODO:

• Remove changes from this commit: 6e41cd5 ---> DONE in 4bd7049
• Remove benchmark data?

Release Management

• Affected package(s): Number_types
• Issue(s) solved (if any): fix How to robustify to_interval(Quotient) #5928
• Feature/Small Feature (if any): Small Feature
• Link to compiled documentation (obligatory for small feature): docs
• License and copyright ownership: no change

[sloriot]

Successfully tested in CGAL-5.5-Ic-77

If I look at the table, it seems that boost 1.79 is not tested, only 1.80 is one 3 plateforms.

[lrineau]

Should we test specifically Boost 1.79? On ArchLinux, I expect the package will be updated soon. Fedora Rawhide is still lagging behind at 1.76 for unknown reasons (Fedora seems shy on updates of Boost).

We could update Boost on Sosno or Christo, at least for one of the test platform? @janetournois Is that easy?