Clearer fit modes that match your loaded data

[AndrewSazonov]

EasyDiffraction now offers only the fitting modes that make sense for what you have loaded: with one dataset you get a normal single fit (and can switch to a sequential scan over a folder of files); with several datasets you get a combined (joint) fit. This removes a confusing case where fitting several datasets one-by-one could make earlier datasets plot incorrectly.

Sequential scans are also clearer to set up — you get a clear message when no data files are found, and a new option can copy the scanned files into your project so it stays self-contained and portable.

[codecov]

Codecov Report

❌ Patch coverage is 92.94118% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.33%. Comparing base (62d5b52) to head (6f2b8c6).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easydiffraction/analysis/analysis.py	90.16%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #207      +/-   ##
===========================================
+ Coverage    90.32%   90.33%   +0.01%     
===========================================
  Files          283      283              
  Lines        24181    24207      +26     
  Branches      2835     2840       +5     
===========================================
+ Hits         21842    21868      +26     
  Misses        1743     1743              
  Partials       596      596              

Flag	Coverage Δ
unittests	90.33% <92.94%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
...action/analysis/categories/fitting_mode/default.py	100.00% <100.00%> (ø)
...tion/analysis/categories/sequential_fit/default.py	100.00% <100.00%> (ø)
src/easydiffraction/display/plotting.py	89.91% <100.00%> (-0.13%)	⬇️
src/easydiffraction/analysis/analysis.py	93.13% <90.16%> (+0.17%)	⬆️

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