Draw a double lined box with a shadow around a text string
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 Syntax

        GT_BlatBox( aString , nRow , nCol , cColour )

 Arguments:

      aString - Array containg string to be output - each element will
                appear on a separate line
      nRow    - Top row of box
      nCol    - Left column of box ( -1 to centre )
      cColour - Colour string

 Returns:

      NIL

 Description:

      Draws a double lined box on screen, with a shadow around the box.
      The text in aString will appear in the box, with each element
      appearing on a new line.

 Examples:

      Show the two text lines "Line1" and "Line2" in a box horizontally
      centred from line 10, in White on Blue :

          GT_BlatBox( { "Line 1" , "Line 2" } , 10 , -1 , "W+/B" )

 Header File: GT_LIB.CH

 Source: BLATBOX.PRG

 Author:  Martin Colloby