Convert from the Grating Dispersion Plane (GDP) to Grating diffracted Angular coordinates (GAC) system.
Array_Type pix_gdp_to_gac( Double_Type x, Double_Type y )
This routine converts a position in the Grating Dispersion Plane (GDP) coordinate system
to the matching position in the Grating diffracted
Angular Coordinate (GAC) system,
using the current settings of the pixlib module.
The (x,y) values are the GDP coordinates in pixels.
The return value is a two-element array which contains the
grating dispersion and cross-dispersion coordinates in degrees.
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