Create Detector Alignment Product that Spectro can use for Rectification
After discussion with @wolfgang.kausch we determined that it would be useful for the spectroscopic pipeline to have a calibration data product that describes the relative position of the detectors to be used for the rectification of the spectra.
This is probably also necessary for the imaging, so we should ensure that we include such an object in the pipeline.
The detector position is supposedly very stable. Only warm-up and cool-down could potentially influence this, but we expect not.