calculate declination and total intensity #78
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What does your PR do?
Adds calculation of magnetic declination and total intensity for the purpose of compass correction.
This adds a small pure python dependency from https://github.com/IAGA-VMOD/ppigrf
It's an up to date package which is actively maintained and archived on zenodo.
What issue does this PR address
Resolves Issue #76
Testing
Added a test with a sanity check value
This time I didn't push an unrelated commit along with the addition