GAL_FLAT

       Transforms the image of a galaxy so that the galaxy appears face-on

       Either a nearest-neighbor approximations or a bilinear interpolation
       may  be used.

       RESULT = GAL_FLAT( image, ang, inc, [, cen, /INTERP ] )

       IMAGE  - Image to be transformed
       ANG  - Angle of major axis, counterclockwise from Y-axis, degrees
               For an image in standard orientation (North up, East left)
               this is the Position Angle
       INC - Angle of inclination of galaxy, degrees

       CEN - Two element vector giving the X and Y position of galaxy center
               If not supplied, then the galaxy center is assumed to coincide
                with the image center

       INTERP - If present, and non-zero, then bilinear interpolation will be
               performed.  Otherwise a nearest neighbor approximation  is used.

       RESULT - the transformed image, same dimensions and type as IMAGE

       A set of 4 equal spaced control points are corrected for inclination
       using the procedure POLYWARP.   These control points are used by
       POLY_2D to correct the whole image.

       Written by R. S. Hill, SASC Technologies Inc., 4 December 1985
       Code cleaned up a bit    W. Landsman      December 1992
       Converted to IDL V5.0   W. Landsman   September 1997

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