Option to not save fit results

Adam Lawrencerequested to merge
save_modelresult_option into main

I have created an option in AnalysisSettings that specifies whether or not we want to save lmfit modelresult objects that are generated by the analysis.

There may be cases where we don't want to save these fits, for example when running automated testing, and we can save time by skipping them.

I have added an extra field in AnalysisSettings that allows us to skip the saving of the fits.

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