Fix unphysical spikes on the edges of the flux calibration vectors #1065
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The PR cures an issue we had on the edges of the flux calibration vectors. The flux calibration fit which comprises convolutions of the model with the resolution matrix is now performed on a data frame with margins along wavelength, and then trimmed back to the original size. The following figure shows in orange the old fluxcalib vector and in blue the new ones, without the unphysical spikes on the edges.