Allow extra options for refining droplets while tracking

[david-zwicker]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (046bdf2) 89.71% compared to head (dd21652) 89.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   89.71%   89.73%   +0.02%     
==========================================
  Files           8        8              
  Lines        1672     1676       +4     
==========================================
+ Hits         1500     1504       +4     
  Misses        172      172              

Flag	Coverage Δ
unittests	89.73% <100.00%> (+0.02%)	⬆️

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Files Changed	Coverage Δ
droplets/image_analysis.py	89.41% <100.00%> (+0.10%)	⬆️
droplets/trackers.py	91.52% <100.00%> (+0.14%)	⬆️

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