Sequential fitting across multi-structure projects, with clearer peak-asymmetry settings

[AndrewSazonov]

Sequential fitting now supports projects built from more than one structure, so a temperature or composition series on a multi-phase model can be fit dataset-by-dataset in a single run.

The four constant-wavelength pseudo-Voigt "empirical asymmetry" settings have been renamed to asym_beba_a0, asym_beba_b0, asym_beba_a1, and asym_beba_b1 after the Bérar–Baldinozzi model they implement, so each value's role is explicit instead of an anonymous 1…4. Scripts and saved projects that used the old asym_empir_* names will need updating.

A new Y₂O₃ cross-engine verification page checks the anisotropic β-tensor ADP convention and the cylindrical absorption correction against a FullProf reference, and documents that the Bérar–Baldinozzi asymmetry is applied with different conventions in cryspy and FullProf, so those coefficients do not transfer one-to-one between the two programs.

Sequential-results plots now connect points in ascending order along the x axis.

Secondary scopes in this branch: documentation (Y₂O₃ verification page) and maintenance (parameter rename, plan/ADR cleanup).

[codecov]

Codecov Report

❌ Patch coverage is 89.13043% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.32%. Comparing base (97ef51b) to head (ec2795a).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easydiffraction/analysis/calculators/cryspy.py	0.00%	4 Missing ⚠️
...s/experiment/categories/background/line_segment.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #206      +/-   ##
===========================================
+ Coverage    90.30%   90.32%   +0.01%     
===========================================
  Files          283      283              
  Lines        24175    24181       +6     
  Branches      2834     2835       +1     
===========================================
+ Hits         21832    21842      +10     
+ Misses        1747     1743       -4     
  Partials       596      596              

Flag	Coverage Δ
unittests	90.32% <89.13%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...rc/easydiffraction/analysis/calculators/crysfml.py	49.00% <ø> (ø)
src/easydiffraction/analysis/sequential.py	98.69% <100.00%> (ø)
.../datablocks/experiment/categories/peak/__init__.py	100.00% <ø> (ø)
...ction/datablocks/experiment/categories/peak/cwl.py	100.00% <100.00%> (ø)
...atablocks/experiment/categories/peak/cwl_mixins.py	91.20% <100.00%> (+4.39%)	⬆️
...n/datablocks/experiment/categories/peak/factory.py	80.43% <ø> (ø)
...asydiffraction/datablocks/experiment/item/enums.py	83.78% <100.00%> (ø)
src/easydiffraction/display/plotting.py	90.04% <100.00%> (+0.02%)	⬆️
...s/experiment/categories/background/line_segment.py	92.95% <0.00%> (ø)
src/easydiffraction/analysis/calculators/cryspy.py	50.16% <0.00%> (ø)

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