Robust build, matlab unit test

Use Matlab test unit class

Attempt to make CMake build more robust from Python

Update syntax for xarray

Thanks to @rprechelt and @stopyun-jirong who noted the new syntax of xarray made this IGRF Python interface need updating

Updated annotation to Python 3.10 style (backward compatible to Python 3.7)

Removed unnecessary CMake code

IGRF13

Update to use IGRF13 model

• use CLI interface instead of f2py--solves numerous long-standing issues in general with f2py by not using it
• use Python >= 3.7 for reliability across Python install types
• add CI to CLI as well as module
• update Matlab interface

vendor code, standard template

• apply project template
• add initial geomag7.0 C code
• vendor datetime2yeardec

CI modernize, black formatting

v1.3.5

add DOI

modernize

modularize for best practice

add examples

Improve robustness with pep8 and mypy type checking

• Requires Python >= 3.6
• mypy type hint validation
• pep8

Inclination and declination included

Include inclination and declination as outputs.

API simplification via xarray

As in numerous other geoscience community programs, we have adopted xarray as the base class for output, naturally aligning data with lat, lon, alt coordinates.

tolerate yeardec or datetime input

v1.2.1

tolerate yeardec or datetime input