Fixes for DA dips, record best params, fix gpu for pvlv mechanisms.

[rcoreilly]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 17.07% and project coverage change: +0.20 🎉

Comparison is base (dc67be0) 37.00% compared to head (e4ae6c0) 37.20%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
+ Coverage   37.00%   37.20%   +0.20%     
==========================================
  Files          54       54              
  Lines       11159    11162       +3     
==========================================
+ Hits         4129     4153      +24     
+ Misses       6793     6771      -22     
- Partials      237      238       +1     

Impacted Files	Coverage Δ
axon/layerparams.go	36.42% <0.00%> (ø)
axon/layertypes.go	41.66% <ø> (ø)
axon/layertypes_string.go	16.66% <ø> (ø)
axon/networkbase.go	50.45% <0.00%> (-0.08%)	⬇️
axon/pvlv_layers.go	6.89% <0.00%> (ø)
axon/pvlv_net.go	0.00% <0.00%> (ø)
axon/layer_compute.go	43.07% <8.33%> (+0.50%)	⬆️
axon/pvlv.go	28.50% <8.33%> (+0.10%)	⬆️
examples/boa/boa.go	86.24% <41.66%> (+2.19%)	⬆️

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