parameter edits

[jmccreight]

• Closes Example of how to generate parameter sets #234
• Tests added
• User visible changes (including notable bug fixes) are documented in whats-new.rst
• New functions/methods are listed in api.rst or it's sub rsts?

[codecov-commenter]

Codecov Report

Merging #232 (c71933d) into develop (811c689) will decrease coverage by 0.10%.
The diff coverage is 87.87%.

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@@             Coverage Diff             @@
##           develop     #232      +/-   ##
===========================================
- Coverage    79.61%   79.52%   -0.10%     
===========================================
  Files           51       51              
  Lines         6491     6506      +15     
===========================================
+ Hits          5168     5174       +6     
- Misses        1323     1332       +9     

Files Changed	Coverage Δ
pywatershed/utils/cbh_utils.py	88.97% <73.33%> (-4.16%)	⬇️
pywatershed/base/parameters.py	93.33% <100.00%> (+3.33%)	⬆️
pywatershed/utils/__init__.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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