Try to fix coverage for share/lib/python/neuron

[JCGoran]

Possible fix for #2836.

Also added coverage for the NMODL Python module (mostly ode.py).

[azure-pipelines]

✔️ 54faf9c -> Azure artifacts URL

[github-actions]

✔️ 54faf9c -> artifacts URL

[github-actions]

✔️ ffed84f -> artifacts URL

[azure-pipelines]

✔️ ffed84f -> Azure artifacts URL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.86%. Comparing base (95bd396) to head (065b762).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3530      +/-   ##
==========================================
+ Coverage   68.44%   68.86%   +0.41%     
==========================================
  Files         683      683              
  Lines      116611   116611              
==========================================
+ Hits        79818    80301     +483     
+ Misses      36793    36310     -483     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

✔️ 065b762 -> artifacts URL

[azure-pipelines]

✔️ 065b762 -> Azure artifacts URL

[ramcdougal]

I don't honestly understand the testing process well enough to asssess this.