A/E survival fractions joint fitter and ecal fix

[ggmarshall]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 67.79661% with 19 lines in your changes missing coverage. Please review.

Project coverage is 48.61%. Comparing base (981877e) to head (018cf61).

Files with missing lines	Patch %	Lines
src/pygama/pargen/AoE_cal.py	67.27%	18 Missing ⚠️
src/pygama/pargen/energy_cal.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
- Coverage   48.80%   48.61%   -0.19%     
==========================================
  Files          59       59              
  Lines        7846     7874      +28     
==========================================
- Hits         3829     3828       -1     
- Misses       4017     4046      +29     

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