              Format of the Colours file

Colours are stored as HEX: BBGGRR00 with one space between entries.

Line    contents
1       3 colours:window background; solid colour; inside colour
2+3     16 user colours
4       8 colours for indexing by #sides
5+6     16 colours of planes
7+8     16 colours for compounds (unused)
9       4 colours of components
10      4 colours of plotted lines: front solid,
        front wire, back solid, back wire
11      (3) R/G stereo background, red and green
12      2 colours of front and back faces
