add welch option for tfest

[baggepinnen]

@fibonatic

[codecov]

Codecov Report

Patch coverage: 85.71% and project coverage change: -0.03% ⚠️

Comparison is base (a1b529c) 87.38% compared to head (364daaf) 87.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   87.38%   87.35%   -0.03%     
==========================================
  Files          13       13              
  Lines        2314     2318       +4     
==========================================
+ Hits         2022     2025       +3     
- Misses        292      293       +1     

Flag	Coverage Δ
unittests	87.35% <85.71%> (-0.03%)	⬇️

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

Files Changed	Coverage Δ
src/frd.jl	87.91% <85.71%> (-0.36%)	⬇️

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