overwrite_min_loops

[thomaswilliamsastro]

This PR adds a force_overwrite_min_loops parameter that means we don't necessarily need to do some minimum number of loops. Currently, this only applies if there's no model flux after the first iteration, or if there's no flux change between loops, but adds an option to extend this to other criteria

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 6.27%. Comparing base (67daf60) to head (a790467).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
phangsPipeline/casaImagingRoutines.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #359      +/-   ##
=========================================
- Coverage    6.27%   6.27%   -0.01%     
=========================================
  Files          38      38              
  Lines       15231   15238       +7     
  Branches     3660    3662       +2     
=========================================
  Hits          956     956              
- Misses      14261   14268       +7     
  Partials       14      14              

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