Clipper colours
 Colours from the Clipper colour palette
------------------------------------------------------------------------------

   The following constants are defined in the header file RPCXLib.CH.

                                                ---- Composition ----
        REGISTER#       CONSTANT                RED     GREEN   BLUE

                0       PL_BLACK                 0       0       0
                1       PL_BLUE                  0       0      42
                2       PL_GREEN                 0      42       0
                3       PL_CYAN                  0      42      42
                4       PL_RED                  42       0       0
                5       PL_MAGENTA              42       0      42
                6       PL_BROWN                42      21       0
                7       PL_WHITE                42      42      42
               56       PL_GREY                 21      21      21
               57       PL_BRIGHT_BLUE          21      21      63
               58       PL_BRIGHT_GREEN         21      63      21
               59       PL_BRIGHT_CYAN          21      63      63
               60       PL_BRIGHT_RED           63      21      21
               61       PL_BRIGHT_MAGENTA       63      21      63
               62       PL_YELLOW               63      63      21
               63       PL_BRIGHT_WHITE         63      63      63