Feat prms tests

[jmccreight]

• Closes Overhaul tests against PRMS output #238
• Closes Bug with soil_moist_prev #245
• Closes Document PRMS and PWS regression/comparisons for v1.0 #246
• Closes New notebook documenting PRMS and PWS comparisons #247
• User visible changes (including notable bug fixes) are documented in whats-new.rst

Finishes #241

[codecov-commenter]

Codecov Report

Merging #244 (0e4bfce) into develop (21520bc) will decrease coverage by 0.58%.
The diff coverage is 72.15%.

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@@             Coverage Diff             @@
##           develop     #244      +/-   ##
===========================================
- Coverage    78.71%   78.13%   -0.58%     
===========================================
  Files           51       51              
  Lines         6539     6563      +24     
===========================================
- Hits          5147     5128      -19     
- Misses        1392     1435      +43     

Files	Coverage Δ
pywatershed/__init__.py	100.00% <100.00%> (ø)
pywatershed/hydrology/prms_canopy.py	80.82% <100.00%> (+0.09%)	⬆️
pywatershed/hydrology/prms_channel.py	93.71% <100.00%> (+0.12%)	⬆️
pywatershed/utils/__init__.py	100.00% <100.00%> (ø)
pywatershed/utils/netcdf_utils.py	83.09% <ø> (+6.56%)	⬆️
pywatershed/hydrology/prms_runoff.py	82.59% <92.85%> (+0.23%)	⬆️
pywatershed/utils/control.py	73.17% <69.23%> (-6.83%)	⬇️
pywatershed/hydrology/prms_soilzone.py	85.38% <56.66%> (-2.85%)	⬇️

... and 1 file with indirect coverage changes

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