Changes from ungu.1.22:

  Changed XRT_SCALE in xrt.h to 1032 to reflect analysis by
  T. Shimuzu and H. Hara on 2007-01-10

  Changed calculation for XRT DATE_OBS and DATE_END to
  match note from R. Kano 2007-01-09

  Dropped DATE_END from SOT FITS files. SOT level 0 files
  do not have level 1 keywords. (DATE_END has been empty
  on previous reformatter versions.)

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