Feature/metk 116 negative levelist

[mcakircali]

levelist type: adds tests and support for range expansion when by < 0

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c00605a) 56.48% compared to head (efde4c9) 56.76%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #38      +/-   ##
===========================================
+ Coverage    56.48%   56.76%   +0.28%     
===========================================
  Files           96       97       +1     
  Lines         5600     5630      +30     
===========================================
+ Hits          3163     3196      +33     
+ Misses        2437     2434       -3     

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[simondsmart]

Looks good :-)