feat: can read from netCDF4 or HDF5 variable groups

[tsutterley]

fix: spelling mistakes

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (727f1af) 70.20% compared to head (d070210) 70.21%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   70.20%   70.21%   +0.01%     
==========================================
  Files          43       43              
  Lines        8987     8991       +4     
  Branches     1182     1182              
==========================================
+ Hits         6309     6313       +4     
+ Misses       2326     2325       -1     
- Partials      352      353       +1     

Flag	Coverage Δ
unittests	70.21% <72.72%> (+0.01%)	⬆️

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Files	Coverage Δ
pyTMD/io/OTIS.py	37.25% <ø> (ø)
pyTMD/time.py	71.00% <ø> (ø)
pyTMD/spatial.py	72.28% <72.72%> (+0.16%)	⬆️

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