Figure showing the in-memory tree representation

[jeromekelleher]

We want a figure which illustrates the in-memory representation of the quintuply linked trees.

Ideally, this would be part of a figure where we also illustrate the way that we transition between adjacent trees. Ie. (A) a particular tree shown with the quintuply linked representation underneath it; (B) tree when we have removed all the outbound edges; and (C) the new tree we have moved to.

We'd want to incorporate the actual edges in there somewhere as well, so this could be quite a busy figure. However, it would get across a lot of information that we want to get to people, so worth the effort, I think.