Improved plots: temperatures, stage lines and annotations, large legends outside axes, regex sample selection

[cgevans]

Checklist:

• Documentation added or revised for changes.
• Tests added for new features and fixes, or revised for changes. (Good enough...)
• Real-system tests run manually, and pass (if applicable).

[codecov-commenter]

Codecov Report

Merging #7 (1fbf509) into main (8e3fcfa) will increase coverage by 0.09%.
The diff coverage is 65.34%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   57.69%   57.79%   +0.09%     
==========================================
  Files          19       19              
  Lines        3725     3793      +68     
  Branches      754      773      +19     
==========================================
+ Hits         2149     2192      +43     
- Misses       1399     1412      +13     
- Partials      177      189      +12     

Impacted Files	Coverage Δ
src/qslib/experiment.py	59.06% <63.04%> (+0.07%)	⬆️
src/qslib/normalization.py	48.42% <85.71%> (+2.96%)	⬆️
src/qslib/protocol.py	74.28% <100.00%> (+0.03%)	⬆️

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