Match RGB FITS orientation to NASA standards
Additional feedback from the SiriL developers indicate that loading RGB FITS images with fits_read_img ()
orients them the opposite way from NASA and other professional standards (as well as SiriL and prior versions of GIMP). This patch flips RGB FITS layers vertically after import to correct.
More information: https://siril.readthedocs.io/en/stable/file-formats/FITS.html#orientation-of-fits-images
Edited by Alx Sa