updates to test suite

[mirochaj]

Removed non-essential functionality (analysis routines, inference helpers) from test coverage report. Added more tests for some Math, Stats, and Misc routines.

[codecov-commenter]

Codecov Report

Merging #35 (ed76c5e) into main (9025451) will increase coverage by 3.79%.
The diff coverage is 82.05%.

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   54.58%   58.38%   +3.79%     
==========================================
  Files         112       87      -25     
  Lines       22240    15692    -6548     
==========================================
- Hits        12139     9161    -2978     
+ Misses      10101     6531    -3570     

Impacted Files	Coverage Δ
ares/solvers/OpticalDepth.py	56.50% <ø> (+2.19%)	⬆️
ares/static/Fluctuations.py	100.00% <ø> (ø)
ares/static/VolumeGlobal.py	64.53% <ø> (-0.10%)	⬇️
ares/util/Stats.py	62.38% <ø> (+38.72%)	⬆️
ares/util/__init__.py	100.00% <ø> (ø)
ares/util/Math.py	87.91% <82.05%> (+41.49%)	⬆️
ares/analysis/ModelSet.py
ares/analysis/TurningPoints.py
ares/inference/GridND.py
ares/inference/ModelFit.py
... and 25 more

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