A stand-alone XDRLIB module extracted from cpython 3.10.8

The xdrlib package has historically been a feature of the core python library. However, as of Python 3.11, the module was deemed to no longer be widely used and has been deprecated, with a target removal version of Python 3.13.

Several of the MDAnalysis projects rely on the xdrlib module for their functionality, specifically for parsing GROMACS TPR and EDR files. To avoid a need to vendor in the xdrlib functionality in multiple projects, we take the approach of creating this stand-alone module which contains the python 3.10.8 xdrlib code and its relevant tests.

The majority of this code is copied from the 3.10.8 release of cpython. Any modifications of the code are mostly cosmetic. A full copy of these modifications can found in the CHANGES file.

Being taken from the cpython 3.10.8 release, the code within this repository falls under the Python Software Foundation License Version 2. Any documentation is also dual licensed with both the PSF License Version 2 and the zero-clause BSD license. More information can be found in the LICENSE file.