Python-gmp

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* Code cleanup.
* Properly return NOTIMPLEMENTED for unsupported arguments in
``**``. Issue 319.

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* Improvements to setup.py.
* Add thread-safe contexts.
* MPFR and MPC are now required.
* Invalid Operation exception now raised for addition, etc.
* inverse() now raises exception if inverse does not exist.
* Add context methods.
* Major code refactoring required to properly support thread-safe contexts.
* `` __str__`` and ``__repr__`` no longer append "L" on Python 2.
* mpq(mpfr) now returns the exact result.
* Fix repr(mpc) for precision >325 bits.
* Intermediate conversions of Integer to mpfr are now done with the
full precision of the Integer.
* Remove support for interaction with Decimal type.
* No longer attempt to override the memory allocation functions.
* Register gmpy2 types into the numeric tower.
* mpz(x) call int(x) if mpz() does not know how to convert x directly.
* Convert `mpz` to a type using ``__new__`` instead of a factory function.
* Bug fix for ``<<small mpfr>> ** <<small Python integer>>``.
* Compile with Python 3.11.

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* Documentation updates.
* Improvements to build environment.

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* Added support for embedded underscore characters in string literals.
* Allow GIL release for `mpz`/`xmpz`/`mpq` types only.

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* Improve argument type processing by saving type information to
decrease the number of type check calls. Especially helpful
for `mpfr` and `mpc` types. (Not complete but common operations
are done.)
* Resolve bug in `mpfr` to `mpq` conversion; issue 287.
* Added limited support for releasing the GIL; disabled by default;
see `context.allow_release_gil`.
* Refactored handling of inplace operations for `mpz` and `xmpz` types;
inplace operations on `xmpz` will only return an `xmpz` result.
* Refactored handling of conversion to C integer types. Some
exception types changes to reflect Python types.
* `gcd()` and `lcm()` now support more than two arguments to align with
the corresponding functions in the math module.

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* Avoid MPFR bug in mfr_fac_ui (`factorial()`) on platforms where
long is 32-bits and argument is >= 44787929.
* Fixed testing bugs with Python 2.7.
* Fixed ``mpz(0)`` to C long or long long.
* Fixed incorrect results in `f2q()`.
* Adjust test suite to reflect changes in output in MPFR 4.1.0.