Create starfield estimates that are less distorted

[svank]

PR summary

This requires remove_starfield v0.0.4

This makes a starfield map that doesn't curve up and down. This means less distortion (unsure if that affects the accuracy of the starfield subtraction) and should offer more speed for the map create (since not blowing things up at extreme declination ought to mean fewer output pixels to reprojection while still capturing everything). Likewise, since this should enable smaller maps, it ought to speed up the subtraction step where it's loading in the star map.

Before:

After:

Todos

None

Test plan

Run it overnight

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 9 lines in your changes missing coverage. Please review.

Project coverage is 86.15%. Comparing base (8552bb6) to head (52240f8).
Report is 47 commits behind head on main.

Files with missing lines	Patch %	Lines
punchbowl/level3/stellar.py	18.18%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   86.30%   86.15%   -0.16%     
==========================================
  Files          56       56              
  Lines        3789     3798       +9     
==========================================
+ Hits         3270     3272       +2     
- Misses        519      526       +7     

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