Matching of all_stars table and the photometry table
How to match stars in the all_stars table (product of select_reference_stars function) to the photometry table (product of pointed_catalogue function, and output of GenerateCatalogue.py).
The FWHM values from the all_stars table are used to generate the photometry table. Only reference stars have the FWHM value, resulting in all stars in photometry table (output of GenerateCatalogue.py) being "reference stars".