add VAR stability metrics ala Ives et al

[nicholasjclark]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@b6948c5). Learn more about missing BASE report.
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
R/stability.R	0.00%	32 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##             master      #73   +/-   ##
=========================================
  Coverage          ?   71.65%           
=========================================
  Files             ?       76           
  Lines             ?    19921           
  Branches          ?        0           
=========================================
  Hits              ?    14274           
  Misses            ?     5647           
  Partials          ?        0           

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