6bone map change and COLORFUL ADDITIONS :-)

[Shin Yoshida]

> I've colorized the nodes, and made a first attempt at identifying transit
> nodes to eventually help in routing, planning, redoing the map, etc.

I'm just curious about how nodes are identified as transit or leaf.

Some "leaf" nodes have up to five tunnels and other "leaf" nodes have
tunnels to real leaf nodes. Some "transit" nodes have as less as three 
tunnels and have no tunnels to real leaf nodes.

Shin