Various small fixes for data release

[samaloney]

Fixes:

1. Actually calculate the Carrington coordinate frame values and use in the headers, closes Value of Carrington longitude is not correct #355
2. Fix casting issue with fits ext for energy table, closes Slight discrepancies in energy edges  #359
3. Remove num_energy_groups, closes num_energy_groups changes rapidly with time  #367
4. Remove energy extension from QL Calibration data, close Remove energy extension from calibration data #338

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b94f0f8) 78.45% compared to head (54a76b2) 77.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   78.45%   77.79%   -0.66%     
==========================================
  Files          65       65              
  Lines        6775     6777       +2     
==========================================
- Hits         5315     5272      -43     
- Misses       1460     1505      +45     

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[samaloney]

E2E differences look as expected to me but 2nd look would be good.

[nicHoch]

this is looking good