reflectometry/refl1d

check back reflectivity works for polarized datasets

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check back reflectivity works for polarized datasets

When applying back reflectivity in load4 with polarized data, the reflectivity appears not to be calculated-- no theoretical plots, only the data. Chisq is infinite and attempting to run cases catastrophic errors. Turning back_reflectivity to False immediately removes the issue. This issue does not seem to appear with unpolarized datasets.

Inverting the layer structure when defining the sample appears to work just fine as a work around.