Fix MPI Divergence issues

[siboehm]

• Compute TrgActAvg after MPI sync
• Add test for CollectDwt and SetDwt

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.97 🎉

Comparison is base (4b3d273) 39.25% compared to head (41c4e8a) 40.22%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
+ Coverage   39.25%   40.22%   +0.97%     
==========================================
  Files          53       53              
  Lines       10285    10285              
==========================================
+ Hits         4037     4137     +100     
+ Misses       6012     5915      -97     
+ Partials      236      233       -3     

Impacted Files	Coverage Δ
axon/layer_compute.go	42.66% <ø> (+0.31%)	⬆️
axon/network.go	43.54% <100.00%> (+18.75%)	⬆️

... and 6 files with indirect coverage changes

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[rcoreilly]

looks good!

[rcoreilly]

ps. I'll make a new release tomorrow with my pcore / STN fixes too.