int casu_photcal_extinct(casu_fits **images, casu_tfits **mstds, casu_tfits **cats, int nimages, char *filt, cpl_table *phottab, int minstars, cpl_frame *schlf_n, cpl_frame *schlf_s, const char *expkey, const char *amkey, float magerrcut, int *status)
Do photometric calibration.