ByteNot()

         Makes a Not of the byte bit to bit

    Syntax:

         ByteNot ( cByte ) -> cNuevoByte

         cByte : Byte to do the Not.

    Description:

         Makes a Not of the especified byte and returns the new byte with
         the result.

    Return:

         The result byte of the Not or Nil if any of the entry bytes is
         not of the type character

    Example:

         ? ByteNot ( "O" )