[Tkinter] Justify the treeview to the last entry

[deanhystad]

This is probably a better solution to the problem. If new items are important to see, they should probably appear at the top of the list. If they aren't important then you shouldn't scroll the view to display them.

I was able to scroll to the bottom, using yview.move_to(), but it only scrolled down every other time I added an item to the list.