Ensure that estimated energy is always recorded in linear scale

[HealthyPear]

This closes #139.

It also fixes a detail about energy estimation à-la-CTAMARS (#92), namely,

[...] the RFs provide estimates for log10 E and its RMS, but the average is done after converting those to linear energy scale)

[codecov]

Codecov Report

Merging #141 (a819c7b) into master (fd7b693) will increase coverage by 0.36%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   65.19%   65.55%   +0.36%     
==========================================
  Files          23       23              
  Lines        2146     2160      +14     
==========================================
+ Hits         1399     1416      +17     
+ Misses        747      744       -3     

Impacted Files	Coverage Δ
protopipe/scripts/build_model.py	85.36% <66.66%> (-0.96%)	⬇️
protopipe/scripts/data_training.py	92.89% <100.00%> (+0.13%)	⬆️
protopipe/scripts/write_dl2.py	81.66% <100.00%> (+0.24%)	⬆️
protopipe/perf/temp.py	100.00% <0.00%> (+12.50%)	⬆️

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