Change/return the colour setting
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 Syntax

        GT_ColorSet( nColorNum , cNewColor )

 Arguments:

      nColorNum - Colour number to be addressed
      cNewColor - Optional new colour string

 Returns:

      The current colour setting

 Description:

      Returns the current setting of the given colour area.
      If cNewColor is passed, the given colour setting is changed to
      cNewColor.
      GT_LIB.CH contains #define values for the available colour areas.

 Examples:

      Change the first colour setting to "W+/R" :

          nColour := GT_ColorSet( 1 , "W+/R" )

 Header File: GT_LIB.CH

 Source: COLORSET.PRG

 Author:  Martin Colloby