Use pooch and update data

[malmans2]

@Mikejmnez I've done a bunch of things:

• Move data to zenodo
• Add hycom_test.{yaml,nc}
• Use pooch under the hood so data are only downloaded if they don't exist or they changed (i.e., use cache)

Please merge if it looks OK so you can make use of this changes in you PR.

BTW, Happy New Year!
Did you get snow chains for your bike?

[codecov]

Codecov Report

Merging #210 (c816f81) into master (0167526) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #210   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          10       10           
  Lines        3809     3809           
  Branches      849      849           
=======================================
  Hits         3630     3630           
  Misses         99       99           
  Partials       80       80           

Flag	Coverage Δ
unittests	95.30% <ø> (ø)

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[Mikejmnez]

@Mikejmnez I've done a bunch of things:

* Move data to [zenodo](https://zenodo.org/record/5825166#.YdbvCnXMKV4)

* Add `hycom_test.{yaml,nc}`

* Use [pooch](https://www.fatiando.org/pooch/latest/) under the hood so data are only downloaded if they don't exist or they changed (i.e., use cache)

Please merge if it looks OK so you can make use of this changes in you PR.

Cool! So the test data will live in zenodo? What will be the procedure if there is new test data (e.g. other simulation, although unlikely at this point) ? Send it to you and you upload it to zenodo?

BTW, Happy New Year! Did you get snow chains for your bike?

Happy New year! How's the UK, or are you traveling anywhere fun? BTW I thought 'snow chains for your bike' was a joke, but it turns out its real! hahaha not yet (there is not enough snow) but will consider it in the future!

[malmans2]

Cool! So the test data will live in zenodo? What will be the procedure if there is new test data (e.g. other simulation, although unlikely at this point) ? Send it to you and you upload it to zenodo?

Not sure if I can add contributors. We'll figure it out when we need it. But at least it's easier to find/more accessible, and we can also keep track of different versions.

Happy New year! How's the UK, or are you traveling anywhere fun? BTW I thought 'snow chains for your bike' was a joke, but it turns out its real! hahaha not yet (there is not enough snow) but will consider it in the future!

Ahahaha, it was a joke! I'm in Italy right now, I should be back in the UK next week. It got pretty cold yesterday, but the weather has been amazing!