Allow multiple BEFORE/AFTER blocks of same type in a mod file.

[nrnhines]

Same extension as BlueBrain/CoreNeuron#790

Includes modified coreneuron_modtests::test_pointer_py_cpu

• Merge CoreNEURON PR and update submodule before merge

[pramodk]

LGTM (require coreneuron merge).

@nrnhines : should this go into 8.1?

[nrnhines]

@pramodk should this go into 8.1
I don't think so. We can let the merge wait til the 8.1 release branch and tag is created.

[codecov-commenter]

Codecov Report

Merging #1722 (41f5db4) into master (30b9eac) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1722      +/-   ##
==========================================
- Coverage   45.34%   45.30%   -0.04%     
==========================================
  Files         551      551              
  Lines      111219   111225       +6     
==========================================
- Hits        50431    50393      -38     
- Misses      60788    60832      +44     

Impacted Files	Coverage Δ
src/nrncvode/netcvode.cpp	66.49% <ø> (ø)
src/nrnoc/init.cpp	87.90% <100.00%> (+0.07%)	⬆️
src/nrnoc/multicore.cpp	85.34% <100.00%> (+0.07%)	⬆️
src/nrnmpi/bbsmpipack.cpp	82.56% <0.00%> (-10.77%)	⬇️
src/parallel/bbsclimpi.cpp	50.00% <0.00%> (-8.14%)	⬇️
src/parallel/bbssrvmpi.cpp	42.16% <0.00%> (-6.03%)	⬇️
src/parallel/bbs.cpp	74.26% <0.00%> (-1.69%)	⬇️

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[pramodk]

I am going to ignore docs PR failure because its related to #1731.