[Fluxus] docs and commits

[Dave Griffiths]

Hi all,

I've started updating the documentation which has turned into a rather
mammoth task, but probably one which is worth spending some time on.
I've begun by converting it into a open office doc and added it to git
in docs/ There are some new sections on lighting, using structs and some
other bits and pieces. There is a very much work in progress pdf here:

http://www.pawfal.org/dave/files/fluxus-documentation.pdf

Feedback most welcome, as always :)

Also, some new stuff in git:

(get-parent): gets the parent of the current primitive
(get-children): gets a list of children of the current primitive (or the
children of the root node if no primitive is current)

An example of how to use this in examples/scenegraph-nav.scm.

Also a new example in examples/dancing-robots.scm of how to use struct
to make complicated scripts easier to write.

cheers,

dave