Uncertainty calculation comparison test for n_sample>1

[nabobalis]

In GitLab by @wtbarnes on Jan 25, 2023, 06:43

When computing uncertainties, there is the option to specify n_sample, the number of pixels that have been averaged together to get that intensity. In the tests that compare the results of this function to the equivalent function in IDL, there should be a comparison test that varies this input. Currently, the comparison tests only use n_sample=1.