AFhread

      Subroutine of WFPCREAD to read a GEIS header from an HST STSDAS image.

       This procedure reads a GEIS header from an HST image.   It then looks
       if a .SHH file is present for FOC images to calculate better
       astrometry by getting the current PSANGLV3 from this file.   Called by
        WFPCREAD.PRO

       AFhread, HdrFile, hdr

       HdrFile - scalar string giving name of STSDAS header for an FOC image

       hdr - string array, FITS header for the FOC image.    The position
               angle of the V3 axis of HST (PSANGLV3) is added, if it could
               be found in the .SHH file

       STRN(), SXADDPAR, SXHREAD, SXPAR()

       Written         Eric W. Deutsch  (U. of Washington)    June, 1994
       Documentation update   W. Landsman  (HSTX)             July, 1994
       Converted to IDL V5.0   W. Landsman   September 1997
       Removed call to EXIST() function   W. Landsman        April 1999

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