Improve codecov reliability

[mborland]

Closes: #589

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.1%. Comparing base (2e81e42) to head (6cd292e).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #616     +/-   ##
=========================================
- Coverage     94.1%   94.1%   -0.0%     
=========================================
  Files          274     274             
  Lines        28563   26765   -1798     
=========================================
- Hits         26872   25162   -1710     
+ Misses        1691    1603     -88     

see 159 files with indirect coverage changes

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