Rescaling improvements

[emirkmo]

• Make rescale uncertainty optional
• Add ensure_greater as an option to the rescaling function, ensuring rescale uncertainties are at least as large as the initial ones within some epsilon mag.
  Fixes Changes to rescale uncertainty #106

[codecov]

Codecov Report

Merging #107 (266beca) into devel (a2ed7c5) will not change coverage.
The diff coverage is 73.33%.

@@           Coverage Diff           @@
##            devel     #107   +/-   ##
=======================================
  Coverage   53.71%   53.71%           
=======================================
  Files          35       35           
  Lines        3083     3083           
=======================================
  Hits         1656     1656           
  Misses       1427     1427           

Impacted Files	Coverage Δ
run_photometry.py	0.00% <0.00%> (ø)
flows/photometry.py	82.55% <100.00%> (ø)

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