Add fit functionality to command line interface

[AndrewSazonov]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.43%. Comparing base (e6dc9a1) to head (4756352).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rc/easydiffraction/analysis/calculators/crysfml.py	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #145      +/-   ##
===========================================
- Coverage    89.45%   89.43%   -0.03%     
===========================================
  Files          134      134              
  Lines         7443     7504      +61     
  Branches       681      690       +9     
===========================================
+ Hits          6658     6711      +53     
- Misses         577      584       +7     
- Partials       208      209       +1     

Flag	Coverage Δ
integration	76.43% <25.00%> (-0.17%)	⬇️
unittests	79.87% <66.66%> (+0.17%)	⬆️

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