Improvements to parameters and preferences

[rbeyer]

Description

• New kalasiris.set_persistent_preferences() functionality so that a library user can set a persistent preferences path rather than having to enter it with each kalasiris function run. Addresses Issue Make parsing stdout more robust to user IsisPreferences #11.
• Can now also pass parameters that do not take an argument to ISIS in a manner similar to how you'd write them on the command line (e.g. getkey("-help")) in addition to the "old" way (e.g. getkey("help__")).

Related Issue

Would close #11 .

How Has This Been Tested?

• make docs
• make test-all

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• 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 pvl project uses.

[codecov]

Codecov Report

Merging #14 (cba3cfb) into main (d22e502) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   92.50%   92.60%   +0.10%     
==========================================
  Files          12       12              
  Lines         480      487       +7     
==========================================
+ Hits          444      451       +7     
  Misses         36       36              

Impacted Files	Coverage Δ
kalasiris/cubenormfile.py	88.57% <ø> (-0.32%)	⬇️
kalasiris/__init__.py	100.00% <100.00%> (ø)
kalasiris/kalasiris.py	92.10% <100.00%> (+2.39%)	⬆️

... and 3 files with indirect coverage changes

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