Update energy loss calculation interface and add CRPropa option

[cescalara]

No description provided.

[codecov]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (93419fd) compared to base (8389940).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           ta_updates     #17    +/-   ##
===========================================
  Coverage        0.00%   0.00%            
===========================================
  Files              29      31     +2     
  Lines            2498    2620   +122     
===========================================
- Misses           2498    2620   +122     

Impacted Files	Coverage Δ
fancy/__init__.py	0.00% <0.00%> (ø)
fancy/analysis/analysis.py	0.00% <0.00%> (ø)
fancy/analysis/results.py	0.00% <0.00%> (ø)
fancy/interfaces/stan.py	0.00% <ø> (ø)
fancy/propagation/cosmology.py	0.00% <0.00%> (ø)
fancy/propagation/crpropa_energy_loss.py	0.00% <0.00%> (ø)
fancy/propagation/energy_loss.py	0.00% <0.00%> (ø)
fancy/propagation/proton_energy_loss.py	0.00% <0.00%> (ø)

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