…EMPO test dataset

* move methods for flattening netcdf and hdf group structures to separate module

* feature/PODAAC-5065 (#129)

* fix way xarray open granules that have  as a time unit

* fix pylint

* change function to use original function if can parse only change units if we can not parse

* make xarray override into its own function

* add test for override_decode_cf_datetime function

* disable pyline one line instead of global

* Update podaac/subsetter/subset.py

Co-authored-by: Frank Greguska <[email protected]>

* add missing parameter to docstring

* typo in docstring

* extract netcdf opening procedure from beginning of `subset() into a new function

* update tests to use netcdf opening wrapper function, to prevent errors with tempo data

* /version 2.3.0-alpha.5

* update `test_specified_variables()` to use netcdf opening wrapper function in multiple places

to prevent errors with tempo data

* cosmetic

* clean up comment and use 'decode_times'=True for test

* feature/issue 126 (#131)

* Add variable leading slash flexibility

* Add tests back to test file

* changelog added and updated

* Update podaac/subsetter/subset.py

Co-authored-by: Frank Greguska <[email protected]>

* update Syntax

* resolve conflict

Co-authored-by: nlensse1 <[email protected]>
Co-authored-by: Frank Greguska <[email protected]>

* /version 2.3.0-alpha.6

* Update build-pipeline.yml

* /version 2.3.0-alpha.7

* Merge changes from origin/develop

* Merge changes from issues/127

Co-authored-by: sliu008 <[email protected]>
Co-authored-by: Frank Greguska <[email protected]>
Co-authored-by: l2ss-py bot <[email protected]>
Co-authored-by: Nick Lenssen <[email protected]>
Co-authored-by: nlensse1 <[email protected]>

# Conflicts:
#	podaac/subsetter/subset.py
#	tests/test_subset.py