Clear the bar area on the screen
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 Syntax

        GT_BarClear()

 Arguments:

      None

 Returns:

      NIL

 Description:

      Clears the area used to display bars on screen.  Assumes that the
      user has output a bar, and wishes to output another.

 Examples:



 Header File: GT_LIB.CH

 Source: BARCLEAR.PRG

 Author:  Martin Colloby