First working space parts!!!

[Tuomas Lukka <lukka@xxxxxxxxxx>]

First working space parts have just landed on the tree!

Get a fresh cvs update and rotate onto bintree:depth and bintree:breadth
from the home cell. You'll see an infinite binary tree grounded at the
root.

The possibilities with these types of structures are immense, but the API
is still very much under construction.

PLEASE look through ZZSpacePart, ZZDimensions and BinaryTreePart and
ZZDimSpace and tell me what you think of the way it is currently done. 

	Tuomas