T_NSTAR

       Driver procedure (for NSTAR) for simultaneous PSF fitting.

       Input and output are to disk FITS ASCII tables.

       T_NSTAR, image, fitsfile, [psfname, groupsel, /SILENT, /PRINT
                               NEWTABLE = , /VARSKY ]

       IMAGE - 2-d image array
       FITSFILE  - scalar string giving name of disk FITS ASCII table.  Must
               contain the keywords 'X','Y' (from T_FIND) 'AP1_MAG','SKY'
               (from T_APER) and 'GROUP_ID' (from T_GROUP).   This table
               will be updated with the results of T_NSTAR, unless the
               keyword NEWTABLE is supplied.

       PSFNAME - Name of the FITS file created by T_GETPSF containing
               PSF residuals, scalar string
       GROUPSEL - Scalar or vector listing the groups to process.  For
               example, to process stars in groups 2 and 5 set
               GROUPSEL = [2,5].  If omitted, or set equal to -1,
               then NSTAR will process all groups.

       VARSKY - If this keyword is set and non-zero, then the mean sky level
               in each group of stars, will be fit along with the brightness
               and positions.
       /SILENT - if set and non-zero, then NSTAR will not display its results
               at the terminal
       /PRINT - if set and non-zero then NSTAR will also write its results to
               a file NSTAR.PRT.   One can specify the output file name by
               setting PRINT = 'filename'.
       NEWTABLE  - Name of output disk FITS ASCII table to contain the results
               of NSTAR.   If not supplied, then the input FITSFILE will be
               updated.
       DEBUG - if this keyword is set and non-zero, then the result of each
               fitting iteration will be displayed.

       FTADDCAL, FTINFO, FTGET(), FTPUT, NSTAR, SXADDHIST,
       SXADDPAR, SXPAR(), READFITS(), WRITEFITS

       Written        W. Landsman         STX Co.    May, 1988
       Check for CCDGAIN, ATODGAIN keywords to get PHPADU  W. Landsman May 1997
       Fixed typo preventing compilation, groupsel parameter W.L. July 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Update for new FTINFO call    W. Landsman   May 2000

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