added ability to unset vars and derefs

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #1970 (6d828d5) into master (d3115c8) will decrease coverage by 0.14%.
The diff coverage is 97.14%.

@@            Coverage Diff             @@
##           master    #1970      +/-   ##
==========================================
- Coverage   96.72%   96.58%   -0.15%     
==========================================
  Files         146      146              
  Lines       27701    27732      +31     
==========================================
- Hits        26793    26784       -9     
- Misses        908      948      +40     

Flag	Coverage Δ
linux	96.58% <97.14%> (-0.15%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/storm.py	98.06% <75.00%> (-0.07%)	⬇️
synapse/lib/ast.py	98.14% <100.00%> (+0.05%)	⬆️
synapse/lib/node.py	97.75% <100.00%> (+<0.01%)	⬆️
synapse/lib/stormtypes.py	97.41% <100.00%> (+0.02%)	⬆️
synapse/tests/utils.py	93.59% <0.00%> (-2.18%)	⬇️
synapse/cortex.py	95.58% <0.00%> (-0.78%)	⬇️
synapse/lib/hiveauth.py	95.96% <0.00%> (-0.77%)	⬇️
synapse/lib/view.py	95.37% <0.00%> (-0.73%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/layer.py	97.81% <0.00%> (-0.07%)	⬇️
... and 1 more

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