Issues with compiling fortran code when installing on Python 3.10+

[Liam-Deacon]

There are issues with compiling when running either:

1. python setup.py build bdist_wheel for python 3.11+
2. pip install -e . fails for Python 3.10+

This appears to be due to the deprecation/removal of numpy.distutils (see https://numpy.org/doc/stable/reference/distutils_status_migration.html#distutils-status-migration)

NOTE: This was observed on Ubuntu 20.04 using gcc/gfortran 7.5.0

[Liam-Deacon]

This has been resolved for python 3.7, python 3.9 through to 3.11 but has issues with python 3.8 (oddly) and python 3.12 due to the removal of numpy.distutils.

There is currently no plans to fix python 3.8, however 3.12+ is essential for the longevity and compatibility of the package going forward. This will be tracked in a separate issue #8