changes to loading for trimming and updates to cal routines to handle 2 stage calibration

[ggmarshall]

No description provided.

[codecov]

Codecov Report

Attention: 180 lines in your changes are missing coverage. Please review.

Comparison is base (9432759) 20.03% compared to head (b6f9576) 19.75%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/pygama/pargen/ecal_th.py	0.00%	133 Missing ⚠️
src/pygama/pargen/utils.py	0.00%	19 Missing ⚠️
src/pygama/pargen/energy_cal.py	10.52%	17 Missing ⚠️
src/pygama/pargen/energy_optimisation.py	8.33%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
- Coverage   20.03%   19.75%   -0.28%     
==========================================
  Files          31       31              
  Lines        6479     6569      +90     
==========================================
  Hits         1298     1298              
- Misses       5181     5271      +90     

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