Apexpy

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* Updated supported Python versions (3.9-3.11)
* Added a ReadTheDocs yaml
* Migrate to using importlib to keep track of package data files

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* Expanded installation instructions in the documenation
* Added unit tests for todays date, ensuring that `apex.dat` is current
* Added cron unit test to GitHub Actions CI
* Added a logo
* Correct indexing bug in Fortran source that was causing array overflow and
memory errors for extrapolated years beyond the latest formal IGRF fit

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* Update Fortran source code to Fortran 90 standards
* Removed Python 2 support
* Updated community and package documentation
* Updated unit test style to reduce duplication and better follow PEP8
* Updated code style using codacy suggestions and reduced complexity
* Added class representation strings to Apex
* Improved input testing for Apex methods
* Added more examples and installation help to the documentation
* Fixed missing microseconds bug in helpers.subsol
* Added function to calculate height along a field line
* Changed installation to use meson
* Added wheel creation to CI
* Updated flake8 ignore syntax

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* Adapted Fortran to read IRGF coefficients from a file (updated to IGRF-13)
* Improved the subsol routine to allow array input
* Improved PEP8 compliance
* Added some missing docstrings to unit tests
* Fixed AppVeyor test environment
* Updated python test versions
* Updated community and package documentation
* Fixed bug where NaNs caused array input to crash
* Fixed bug in quasi-dipole to apex conversion at equator
* Removed duplicate CI services

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* Updated installation instructions
* Simplified warning tests
* Made some PEP8 changes

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* Updated badges and added DOI
* Added tests for python 3.6
* Removed tests for python 3.3
* Made some PEP8 changes