fix: allow variable case for Doodson number formalisms

[tsutterley]

feat: added property for Extended Doodson numbers in constituents
fix: use Love numbers for long-period tides when inferring (won't affect tilt factors)

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 12 lines in your changes missing coverage. Please review.

Project coverage is 70.85%. Comparing base (3d34f83) to head (da01d65).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pyTMD/io/constituents.py	20.00%	8 Missing ⚠️
pyTMD/arguments.py	50.00%	1 Missing and 2 partials ⚠️
pyTMD/io/model.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #361      +/-   ##
==========================================
- Coverage   70.90%   70.85%   -0.05%     
==========================================
  Files          41       41              
  Lines       10391    10401      +10     
  Branches     1130     1131       +1     
==========================================
+ Hits         7368     7370       +2     
- Misses       2562     2570       +8     
  Partials      461      461              

Flag	Coverage Δ
unittests	70.85% <42.85%> (-0.05%)	⬇️

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