Appendix C.4: list of colors

[Graham Percival]

Hi all, I'm back.

I added a small section for colors in Advanced notation.  I think we 
should add an
appendix which lists the available colors; both the normal color names 
(red, blue,
whatever) and the x11 colors.  Can the list of normal color names be 
generated
automatically?

Cheers,
- Graham