Feat prms tests

[jmccreight]

• Partially addresses Overhaul tests against PRMS output #238

  • Refactor PRMSChannel, PRMSGroundwater, PRMSSolarGeometry
  • Introduce common utils for comparing results both in memory and in file

• Tests added: tests improved and refactor to fit into CI storage

• Fix bug with new matplotlib version. (no issue)

• Fix bug with new xarray version. (no issue)

• Handle acceptable warnings in pytests

Finished by #244

[codecov-commenter]

Codecov Report

Merging #241 (48db5fd) into develop (fb9a0f3) will decrease coverage by 0.48%.
The diff coverage is 57.14%.

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@@             Coverage Diff             @@
##           develop     #241      +/-   ##
===========================================
- Coverage    79.19%   78.71%   -0.48%     
===========================================
  Files           51       51              
  Lines         6536     6539       +3     
===========================================
- Hits          5176     5147      -29     
- Misses        1360     1392      +32     

Files	Coverage Δ
pywatershed/hydrology/prms_runoff.py	82.36% <100.00%> (-0.24%)	⬇️
pywatershed/hydrology/prms_snow.py	89.56% <100.00%> (-1.05%)	⬇️
pywatershed/hydrology/prms_soilzone.py	88.23% <100.00%> (ø)
pywatershed/analysis/process_plot.py	16.93% <0.00%> (ø)
pywatershed/utils/prms5util.py	31.77% <33.33%> (+0.02%)	⬆️

... and 6 files with indirect coverage changes

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