Fixed a MPI bug with MultiCompartmentReaction which produce membrane currents.

[adamjhn]

In initialize_multicompartment_reaction when mpi flag is used reaction_indices were free after being copied to all_reaction_indices. This caused a problem if set_rxd_current was called, setting the initialize_multicompartment_reaction flag to FALSE, so all_reaction_indices get set again, having cleared the original reaction_indices.

This fix keeps two copies of reaction indices, one for the process in reaction_indices and one for all of the processes in all_reaction_indices.

[codecov]

Codecov Report

❌ Patch coverage is 65.21739% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.31%. Comparing base (f0fe2c5) to head (3be830c).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/nrnpython/grids.cpp	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3736      +/-   ##
==========================================
+ Coverage   68.28%   68.31%   +0.02%     
==========================================
  Files         689      689              
  Lines      111033   111043      +10     
==========================================
+ Hits        75816    75855      +39     
+ Misses      35217    35188      -29     

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[github-actions]

✔️ 6203738 -> artifacts URL

[sonarqubecloud]

Quality Gate passed

Issues
12 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]

✔️ 3be830c -> artifacts URL

[azure-pipelines]

✔️ 3be830c -> Azure artifacts URL