Added new undo/redo methods which uses the new undo/redo stacks in model.
Added new undo/redo methods which uses the new undo/redo stacks in
model.

Signed-off-by: Jakob Brandsborg Ehmsen <387ed33cc9ebf98b733caa2520baacd616b28aa5@gmail.com>
jakobehmsen/dynamake