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     The _remappalette function assigns a new color value to a color
     index. The _remapallpalette function remaps all of the color
     indexes simultaneously to the colors given in the <colors> array.
     Both functions affect the current display immediately.
 
     Both functions work in all graphics modes, but only with EGA,
     MCGA, or VGA hardware. An error results if either function is
     called while using any other hardware configuration, including
     Olivetti or Hercules.
 
     For _remapallpalette, only the first <n> elements of the <colors>
     array are used, where <n> is the number of colors supported by the
     current video mode. The number <n> can be found as the <numcolors>
     element of the videoconfig structure.
 
     For the default color assignments of the color indexes, and an
     explanation of specifying a color with a long value, see
     ◄Graphic Mode Colors►
 
     The _remapallpalette and _remappalette functions do not affect the
     presentation-graphics palettes, which are manipulated with the
     _pg_getpalette, _pg_setpalette, and _pg_resetpalette functions.
 
     Return Value
 
     If successful, _remapallpalette returns 0 (short) and _remappalette
     returns the color value previously assigned to index. Either
     function returns -1 if the hardware configuration is incorrect (not
     VGA, MCGA, or EGA). The _remappalette function will also return -1
     if the color index is out of range.
 
     Note that _remapallpalette returns a short value and _remappalette
     returns a long value.
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