BUG: SSUSI bug and function deprecation

[aburrell]

Description

Fixes a bug identified when running several years of SSUSI data that revealed the dimensions sometimes change. Also deprecated a function introduced to pysat from this package, partially addressing issue #169.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Added a unit test and also loaded a year of data (2010, one day at a time) for F16.

Test Configuration

• Operating system: OS X Big Sur
• Version number: Python 3.9
• Any details about your local setup that are relevant: https://github.com/pysat/pysat/pull/1123

Checklist:

• [x] Make sure you are merging into the develop (not main) branch
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] Add a note to CHANGELOG.md, summarizing the changes
• [x] Update zenodo.json file for new code contributors

[aburrell]

Failing due to issues addressed in #129, I believe.

[jklenzing]

Since SSUSI data has not yet been released, do we need to deprecate the code? The next release here will be after pysat 3.1.0 and have that as a minimum req.

[aburrell]

Waiting on https://github.com/pysat/pysat/pull/1116 and https://github.com/pysat/pysat/pull/1123 before tests will pass.

[jklenzing]

Re-running with pysat 3.1.0, we get

 ValueError: coordinate 'Epoch' not present in all datasets.

for the timed saber data. This appears in the other pull too, so something probably changed with expand_dims. Or possibly there's another update I haven't seen yet

[jklenzing]

Found the bug, it was in issue with TIMED SABER revealed by the new exapnd_dims code. Out of scope here, working on a solution. Wrote up a summary in #174

[jklenzing]

Merging in the recent changes from develop should fix the errors