Pvl loads fix

[antonhibl]

Addresses #586 and compliments #584 by allowing that verification script to account for these changes which allow PVLModules to be used with ale.load(s).

Licensing

This project is mostly composed of free and unencumbered software released into the public domain, and we are unlikely to accept contributions that are not also released into the public domain. Somewhere near the top of each file should have these words:

This work is free and unencumbered software released into the public domain. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain.

• I dedicate any and all copyright interest in this software to the public domain. I make this dedication for the benefit of the public at large and to the detriment of my heirs and successors. I intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 15.81%. Comparing base (ec88933) to head (6bb46f4).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
ale/base/label_isis.py	0.00%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #587      +/-   ##
==========================================
- Coverage   15.82%   15.81%   -0.01%     
==========================================
  Files          56       56              
  Lines        6283     6284       +1     
==========================================
  Hits          994      994              
- Misses       5289     5290       +1     

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[acpaquette]

This PR needs to be based off of main rather than whatever branch it was branched from. Easiest way to do that is to just create a new branch from main and cherry-pick the changes into it