FUNCTION SBUNSHADOW()

  Short:
  ------
  SBUNSHADOW() Removes shadow drawn with SBSHADOW()

  Returns:
  --------
  Nil

  Syntax:
  -------
  SBUNSHADOW(aSaved)

  Description:
  ------------
  Removes a shadow around a box created with
  SBSHADOW(). SBSHADOW() returns an array containing the
  coordinates and saved screens for each side of the shadow.
  SBUNSHADOW uses this array to restore the previous screens.

  Examples:
  ---------
   Dispbox(10,10,20,20)
   aSaved := sbshadow(10,10,20,20,3,8)
             // draws a shadow in the lower right
                              // of color gray on black
   sbunshadow(aSaved)         // restore old screen

  Source:
  -------
  S_BOXES.PRG