BUG/ENH: ACE Meta data and unused time dimensions

[jklenzing]

Description

Addresses #186

Creates a custom load routine for ACE data products. Data is loaded as xarray, then extra dimensions (labels for string time values) are dropped.

• epam and swepam converted to pandas DataFrame after extra dimensions are dropped
• Updates label types to match pysat standards (float, int, str)
• Changes directly applied since ACE instruments are not released in a previous version
• Fixed a bug where the ACE clean routine was trying to apply fill vals to coords

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Using the workflow in #186 and checking the metadata

Test Configuration

• Operating system: Monterrey
• Version number: python 3.10.9

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

[jklenzing]

warnings down from 4505 to 1277

[jklenzing]

Still a few to fix, all in the mag_l2 key 1hr instrument.

import pysat
mag = pysat.Instrument('ace', 'mag_l2', tag='key', inst_id='1hr', use_header=True)
mag.load(2020, 1)

All three variables throw the 'meta dropped for fill' warning when run with the clean routine, but are fine info clean_level is set to None. Inspecting the metadata, it looks like everything is transferred correctly.

EDIT: I would be ok leaving this as an issue for 0.1.0