Refine flat field fit from scratch

This simplifies the fitting of flat field correction by directly refining the fit instead of doing the former fit on the ratio of 2 different beam orders and having to define proper threshold.

assigned to @lleguy

added 9 commits

• 612d8e31...ee4b54cd - 8 commits from branch master
• 1e6ceb92 - Adds option to refine flat field fit from scratch

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added 1 commit

• f56eb45c - Simplify Small data notebook

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added 1 commit

• 3bdd9258 - Simplifies flat field with direct refine fit in notebook

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added 2 commits

• c4001015 - Simplifies flat field with direct refine fit in notebook
• 205d5fc1 - Simplifies flat field with direct refine fit in notebook

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added 1 commit

• 3c8284a8 - Update changelog

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marked this merge request as ready

changed title from WIP: Adds option to refine flat field fit from scratch to Refine flat field fit from scratch

merged

mentioned in commit f8b12329