Add persistent peak diagram capability

[jdtuck]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 9.66184% with 187 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.23%. Comparing base (db48863) to head (1094ec8).

Files with missing lines	Patch %	Lines
fdasrsf/PPD.py	9.94%	154 Missing ⚠️
fdasrsf/time_warping.py	8.33%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   17.43%   17.23%   -0.20%     
==========================================
  Files          29       30       +1     
  Lines        7891     8098     +207     
==========================================
+ Hits         1376     1396      +20     
- Misses       6515     6702     +187     

Files with missing lines	Coverage Δ
fdasrsf/time_warping.py	15.04% <8.33%> (-0.23%)	⬇️
fdasrsf/PPD.py	9.94% <9.94%> (ø)

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