Build9 modifications

[rbeyer]

These are primarily bug-fixes related to SQLAlchemy table relations, but there are also some miscellaneous fixes.

Description

• validators.validate_dateimte_asutc now properly raises a ValueError if the provided tz-aware datetime has a non-UTC tz offset (before any tz-aware datetime would pass the validator).
• image_records.ImageRecord object now has pgaGain instead of ppaGain (which was surely a typo in the early upstream data.
• create_image.py now correctly imports all of the tables that have a relation to the image_records table so that SQLAlchemy can properly resolve them, and downstream users of the create_image.create() function don't need to worry about sorting that out.
• nss_simulator.py, when asked to produce an output set of maps, uses a zero nodata value rather than whatever nodata value was present in the input burial depth map.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Licensing:

This project is released under the LICENSE.

• I claim copyrights on my contributions in this pull request, and I provide those contributions via this pull request under the same license terms that the vipersci project uses, and I have submitted a CLA.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (88bef16) 67.55% compared to head (12aa4fc) 67.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   67.55%   67.59%   +0.03%     
==========================================
  Files          44       44              
  Lines        2466     2472       +6     
==========================================
+ Hits         1666     1671       +5     
- Misses        800      801       +1     

Files	Coverage Δ
src/vipersci/__init__.py	100.00% <100.00%> (ø)
src/vipersci/vis/anaglyph.py	98.59% <ø> (ø)
src/vipersci/vis/create_image.py	70.90% <100.00%> (+0.81%)	⬆️
src/vipersci/vis/db/image_records.py	90.53% <100.00%> (ø)
src/vipersci/vis/db/validators.py	95.23% <100.00%> (+0.50%)	⬆️
src/vipersci/carto/nss_simulator.py	56.25% <0.00%> (-0.90%)	⬇️

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