mp++ 0.23

This is a minor release that features an important API change: several generic constructors of the multiprecision classes are not marked explicit any more. This change improves the library's ergonomics and interoperability with other generic C++ libraries.

Another small addition is a new fabs() overload for real128, equivalent to the existing abs() functions for the computation of the absolute value.

The full changelog, as usual, is available here:

https://bluescarni.github.io/mppp/changelog.html