Add bpz-demo-data option to get-data command

[OliviaLynn]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c768b4a) 97.12% compared to head (51aab75) 97.13%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   97.12%   97.13%           
=======================================
  Files          32       32           
  Lines        1671     1673    +2     
=======================================
+ Hits         1623     1625    +2     
  Misses         48       48           

Files	Coverage Δ
src/rail/cli/options.py	90.69% <100.00%> (+0.22%)	⬆️
src/rail/cli/scripts.py	89.42% <100.00%> (+0.10%)	⬆️

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[eacharles]

Look good.

have you given thought to how we might expand this as additional data items show up?

[OliviaLynn]

My general plan is that all standard data would go into "data_files." The bpz data is only quarantined as a separate flag because it's dummy data that should very much not be used for anything else.

(While I mention it in the help description of the flag, I realize it would probably be nice to add a comment in the get_data function itself. Just added a new commit.)

Please feel free to let me know if you have a different plan in mind.

[eacharles]

Ok, makes sense. Thanks