NOTE: ON USE OF COLOR FILES WITH FST. (cols.fcd)

In earlier versions of FLY.EXE, if you applied a color file,
it was used over the entire elevation for EACH square
(50 x 50 km terrain tile).

As of at least FLY.EXE 1.47 this seems to be corrected.  Now,
the color file is spread over all the terrain tiles for that
sim.  For example, if you have a terrain tile which is 16000 ft.
and another which is 3000 feet, you will still get a complete
spread from zero to 16000 feet, instead of a zero to 3000 ft.
spread for all 16 colors (as it was with earlier versions) in
one tile and the same for another.

The corrected effect allows for snow at high altitudes in one tile
which does not appear in another.
