Experiment with using xoak for indexing

[dcherian]

https://xoak.readthedocs.io/en/latest/

Xarray will make this stuff much easier in 6 months, so this was a quick expt to see what's possible today.

[andersy005]

This dataset is huge (per Readthedocs standards)

filepath = pop_tools.DATASETS.fetch('Pac_POP0.1_JRA_IAF_1993-12-6-test.nc')

As a result, the docs build on Readthedocs may fail due limited resources. so, You may want to add this notebook to this list of notebooks that are excluded from execution during documentation build

pop-tools/docs/source/conf.py

Lines 62 to 64 in 7272a63

	execution_excludepatterns = [
	'examples/pop_div_curl_xr_xgcm_metrics_compare*',
	'examples/CloseHeatBudget_POP2*',

[andersy005]

Never mind :). I just realized that notebook was successfully executed on RTD