Converts numeric attribute to Clipper colour string
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 Syntax

       GT_NToColor(<nAttribute>) --> <cColourString>

 Arguments:

     <nAttribute> The integer attribute to convert to a Clipper colour
     string

 Returns:

     The Clipper Colour string

 Description:

     Converts an attribute numeric into a Clipper colour string

     Note: The module also includes a C/ASM callable function equivelant
           in the form of:

              char * gt_NToColor (int color);

 Examples:

     ? GT_NToColor(31)         // Result: "W+/B"

 Source: NTOCOLOR.C

 Author:  Ian 'DrDebug' Day (Dark Black Software Ltd.)