During recalculating of length for rope nodes any that do not branch
will be removed, e.g. node B:

	            A
	           / \
	         (B)  <subtree 1>
	         /
	<subtree 2>

results in:

	            A
	           / \
	<subtree 2>   <subtree 1>

Note: Does free entire tree.

Ropes should be rebalanced at the end of this function once
rope_rebalance() is implemented.

(Probably need a rebalance function to go along with/replace this)