AeroDyn cleanup

[bjonkman]

This code

• addresses some potentially uninitialized variables in AeroDyn (caught by Intel Inspector),
• adds some more error handling,
• replaces syntax that gfortran may not like (based on past experience: old-NWTC/NWTC_Library@976d9bd),
• fixes some typos in the documentation, and
• updates comments in the example airfoil polar files to indicate new UA parameters that can be included

Related issue, if one exists
We should check if this helps with #841

Impacted areas of the software
docs, AeroDyn, AeroDyn driver

[codecov-commenter]

Codecov Report

Merging #863 (bbb38dd) into dev (3fd75f6) will increase coverage by 0.00%.
The diff coverage is 20.00%.

@@           Coverage Diff           @@
##              dev     #863   +/-   ##
=======================================
  Coverage   11.28%   11.29%           
=======================================
  Files         211      211           
  Lines      310488   310557   +69     
  Branches   181011   181045   +34     
=======================================
+ Hits        35054    35068   +14     
- Misses     231363   231395   +32     
- Partials    44071    44094   +23     

Flag	Coverage Δ
regtests	11.18% <20.00%> (+<0.01%)	⬆️
unittests	2.57% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
modules/aerodyn/src/AeroDyn_IO.f90	27.02% <0.00%> (-0.13%)	⬇️
modules/aerodyn/src/BEMT.f90	32.10% <0.00%> (-0.12%)	⬇️
modules/aerodyn/src/FVW.f90	29.57% <0.00%> (-0.08%)	⬇️
modules/nwtc-library/src/ModMesh.f90	16.61% <ø> (ø)
modules/aerodyn/src/AeroDyn_Driver_Subs.f90	29.74% <11.76%> (-0.31%)	⬇️
modules/nwtc-library/src/NWTC_IO.f90	26.44% <26.19%> (+0.01%)	⬆️
modules/aerodyn/src/AeroDyn.f90	27.11% <50.00%> (+0.04%)	⬆️
modules/aerodyn/src/AirfoilInfo.f90	28.77% <50.00%> (-0.17%)	⬇️
modules/aerodyn/src/AeroDyn_Driver.f90	78.72% <100.00%> (+0.46%)	⬆️

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[ebranlard]

These changes looks good to me and might fix the issues with the AD reg tests failing at times. Thanks for doing that!

[rafmudaf]

It all looks good to me, as well. Thanks for trying to track down the problem in #841. Let me know when you're ready to merge this pull request.

[bjonkman]

You can merge it now. If I decide to dig into this some more, I'll open another PR.

[bjonkman]

Thanks!