Updates to Goland wing example

[rafapalacios]

Minor fixes and a few more comments on the Goland wing flutter example

[sduess]

Thanks Rafa!

[codecov-commenter]

Codecov Report

Merging #234 (e0bbfcf) into develop (3e5efc7) will increase coverage by 0.06%.
The diff coverage is 83.99%.

@@             Coverage Diff             @@
##           develop     #234      +/-   ##
===========================================
+ Coverage    67.14%   67.20%   +0.06%     
===========================================
  Files          155      155              
  Lines        25933    25921      -12     
===========================================
+ Hits         17413    17421       +8     
+ Misses        8520     8500      -20     

Impacted Files	Coverage Δ
sharpy/utils/generate_cases.py	72.31% <ø> (ø)
sharpy/solvers/steplinearuvlm.py	37.16% <20.00%> (ø)
sharpy/solvers/noaero.py	53.84% <22.22%> (ø)
sharpy/solvers/rigiddynamiccoupledstep.py	56.25% <33.33%> (-4.13%)	⬇️
sharpy/solvers/initialaeroelasticloader.py	46.77% <40.00%> (-2.46%)	⬇️
sharpy/postproc/liftdistribution.py	42.85% <50.00%> (-0.68%)	⬇️
sharpy/postproc/plotflowfield.py	46.09% <50.00%> (ø)
sharpy/postproc/stallcheck.py	38.63% <50.00%> (ø)
sharpy/utils/exceptions.py	64.40% <50.00%> (-1.64%)	⬇️
sharpy/solvers/dynamicuvlm.py	56.56% <66.66%> (-0.87%)	⬇️
... and 40 more

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