Change the flash brightnes etc of a colour string.
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 Syntax

        GT_Hilite([<cColour>]) -> cNewColour

 Arguments:

      <cColour> is the colour to use. If not specified
      the default colour will be used.

 Returns:

      cNewColour

 Description:

      Change the flash brightnes etc of a colour string.

 Examples:

      // Hilite
      cFlash := GT_Hilite(cMessageColour,'*')

 Source: GT_HILIT.PRG

 Author:  Martin Bryant