TRIPP_EXTRACT_FLUX

       Automatical reduction of CCD frames to extract photometrical
       time series. Needs aperture mask stored in file <mask_file>
       and a catalog of reference star positions <pos_file>, created by
       programs TRIPP_DEFINE_MASK and TRIPP_REDUCTION.

       Astronomical Aperture Photometry

       TRIPP_EXTRACT_FLUX, logname [,/intup, /silent, /no_cntrd,
                           framenumbers=framenumbers,
                           frameshift=frameshift, /recycle, /skyfit]

       logname:          Logfile, containing information about where
                         to find both the original and the reduced
                         images, the mask file, and the pos file, which
                         will all be needed here

        silent:          Create no plots during run
        no_cntrd:        Do not try to re-center aperture on star
        intup:           Add up all the (reduced) images
        framenumbers:    Number of exposures per frame
        frameshift:      Pixels by which each exposure is shifted with
                         respect to the previous one
        recycle:         re-use old flux file and amend it
        skyfit:          display sky levels from tripp_rad_plot as
                         compared to tripp_flux

       IDL save <flux_file> containing fluxes and areas in masks.

        If the /intup keyword is set, a fits file with the sum of all
        images (correctly shifted onto each other) will be produced

        none

        If the silent keyword is not set, up to three displays
        (window 0, 1 and 2)
        will be created during the run and destroyed at its end

       Version 1.0, 1996      , Ralf Geckeler -- CCD_PRED
       Version 2.0, 1999/02/06, Jochen Deetjen
       Version 2.1, 1999/02/06, Stefan Dreizler; keyword silent added
       Version 2.1, 2000/11   , Sonja L. Schuh: added keyword no_cntrd
       Version 2.1  2001/01   , S.L. Schuh, change image to
                                  long(image) after READFITS
       Version 2.2  2001/02   , S.L. Schuh, defaulted silent to zero,
                                added display of extraction areas for
                                each image
                    2001/02   , SLS, added messages
                    2001/02   , SLS, added intup keyword and
                    calculations
                    2001/02   , SLS, adapted calls to tripp_tv to
                                correct handling of different image
                                sizes, also for /intup
                                SLS, exptime array is new
       Version 2.3  2001/05   , S.L. Schuh, more tests for frame
                                transfer method from BUSCA, correct time
                                stamps still missing but at least has
                                differential time marks now
                                undone: SLS, avoid error in mmm via
                                tripp_tv if image to display has
                                negative entries (i.e. in
                                "reduced" overscan area)
                    2001/05   , SLS, switched to
                                tripp_read_pos
                                added recycle capabilities
                    2001/05   , SLS, skyfit keyword, no action on
                                data
                    2001/06   , SLS, added variable extraction radius
                    2001/06   , SLS,  debugged recycling for auto
                                radius
                    2001/07   , SLS, suppress *all* windows if silent
                                is set (a bug had been introduced here
                                together with radauto)
                    2005/04   , TOH, added support for utime (for WET)
                    2005/11   , S.S. uint() in writefits call
                                to avoid excessive intup file size
                    2006/03   , S.S. changed call to tripp_get_gjd

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