Improved sample handling

[rozyczko]

Yet another huge PR with too much functionality added.

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 98.03922% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.16%. Comparing base (70066df) to head (0b9a181).

Files with missing lines	Patch %	Lines
src/easyreflectometry/project.py	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #293      +/-   ##
===========================================
+ Coverage    87.88%   88.16%   +0.28%     
===========================================
  Files           45       45              
  Lines         2584     2620      +36     
  Branches       311      315       +4     
===========================================
+ Hits          2271     2310      +39     
+ Misses         242      238       -4     
- Partials        71       72       +1     

Flag	Coverage Δ
unittests	88.16% <98.03%> (+0.28%)	⬆️

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Files with missing lines	Coverage Δ
src/easyreflectometry/fitting.py	98.90% <100.00%> (+2.40%)	⬆️
src/easyreflectometry/project.py	81.40% <93.75%> (+0.74%)	⬆️

... and 1 file with indirect coverage changes

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