Shuffles screen in blocks of four characters
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 Syntax

        GT_Shufl(<nSeconds>) -> NIL

 Arguments:

      <nSeconds> This is the amount of seconds to pause between 'shuffles'
                 Defaults to 0 seconds

 Returns:

      NIL

 Description:

      Screen saver for any Clipper application. This screen saver shuffles
      blocks of 4 characters around the screen, it goes quite fast so a
      parameter is included to slow the thing down a bit.

 Examples:

      GT_Shufl(0.2) -> NIL

 Source: GT_SHUFL.PRG

 Author:  Phillip Hamlyn