t.s.u.tktree : module documentation

What I want it to look like:

+- One | \- Two | |- Three | |- Four | +- Five | | \- Six | |- Seven +- Eight | \- Nine

Class	Node	No class docstring; 6/6 methods documented
Class	FileNode	Undocumented
Class	TreeItem	No class docstring; 1/5 methods documented
Class	ListboxTreeItem	Undocumented
Class	ListboxTree	No class docstring; 3/11 methods documented