Added setup, test, doc, lint and dev requirements. First working release on...

Added setup, test, doc, lint and dev requirements. First working release on PyPI. Updated version info.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
3 jobs for v0.18.9 in 12 minutes and 34 seconds (queued for 19 minutes and 32 seconds)
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