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GU Description:

   Grid utility to manipulate multiblock PLOT3D grids or function files,
   in one of many ways per run.

History:

   05/01/13  Ryan McDaniel   Original release (mostly FORTRAN 77).
   May 2013  David Saunders  Fortran 90 version.  Swap x/y/z option added.
   09/09/13    "      "      Ryan found mirrored block handedness was
                             forgotten.  Also: the header record of
                             unformatted blocks extracted as a chunk was
                             wrong (not one record).
   12/12/17    "      "      Ryan found that the handedness wasn't maintained
                             for the "swapijk" option.
Menu:

   write (*, '(/, (3x, a))') &
      'reorder blocks (r)',                      &
      'extract blocks (e)',                      &
      'combine grids (b)',                       &
      'convert formatted <--> unformatted (c)',  &
      'sequence (s)',                            &
      'count points (n)',                        &
      'unit conversion (u)',                     &
      'add zeros (pad 2d for Gridgen) (a)',      &
      'remove zeros (for dplr2d) (z)',           &
      'extract surface k = 1 or kmax (x)',       &
      'swap i/j/k (i)',                          &
      'swap x/y/z (y)',                          &
      'fix a surface file to have kmax = 1 (f)', &
      'mirror grid (m)',                         &
      'probe for max and min (p)',               &
      'scale outer boundary (o)',                &
      'extrude 2d plane to create 3d volume (v)'
Source: README, updated 2017-12-13