Add layer cloning

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Merging #1819 into master will increase coverage by 0.08%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master    #1819      +/-   ##
==========================================
+ Coverage   96.17%   96.25%   +0.08%     
==========================================
  Files         140      140              
  Lines       27317    27382      +65     
==========================================
+ Hits        26271    26357      +86     
+ Misses       1046     1025      -21     

Flag	Coverage Δ
#linux	96.25% <97.05%> (+0.08%)	⬆️
#linux_replay	66.52% <95.58%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
synapse/lib/layer.py	97.81% <94.73%> (-0.04%)	⬇️
synapse/cortex.py	95.64% <97.14%> (+0.03%)	⬆️
synapse/lib/lmdbslab.py	98.86% <100.00%> (+0.22%)	⬆️
synapse/common.py	96.78% <0.00%> (+0.32%)	⬆️
synapse/lib/spawn.py	95.48% <0.00%> (+6.45%)	⬆️

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