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  Name:     blinkbit() - turn blink on/off, get 16 background colors
  Usage:    blinkbit(<logical>)
  Params:   logical value - .T. turns the blink attribute bit on,
            .F. disables the blink attribute allowing 16 different
            background colors instead of the normal 8.
  Returns:  nothing

 ---------------------------------- Example ---------------------------------

                 blinkbit(.T.)
                 setcolor("W*/B,B/W,W/B)
                 * any character printed will blink

                 blinkbit(.F.)
                 setcolor("W*/GR")
                 * any characters displayed with the blink bit
                 * set on will have a high intensity background

  Note:     The blink bit enable/disable feature lets you have
            16 different background colors instead of the normal
            8. Whenever the blink bit is set to off, the background
            will be displayed in high intensity colors if the
            color to be displayed was supposed to blink. To
            display the high intensity background colors, use the
            * (asterisk) as part of the color, and the resulting
            background color will be displayed in high intensity.
            When using integer attributes, add 128 to the color
            to set the blink bit on. On MDA adaptors, setting the
            blink bit off will display the background in high
            intensity white if the background color is white
            and the blink bit is on in the color attribute.