```
labelme data_annotated --labels labels.txt --config
  '{shape_color: manual, label_colors: {person: [0, 0, 255]}, default_shape_color: [255,0,0]}'
```

Making sure that "Save" is triggered with a point is added or removed.
Making minor change to ensure that "Save" is only triggered when a change has actually been made.

The original method just selected the first encountered vertex in some
epsilon-neighborhood of the mouse cursor. Now the closest one is
picked. This is done in O(number_of_vertices) and could be someday
improved by more efficient nearest neighbor using k-d tree.

Add edit/copy/delete actions to menu, so that their shortcuts are
available as well.

Copy line/fill color when duplicating shapes.

Fix off by one error in double click event handler and refactor closing
and finalising code.

The closed attribute of the new shape was not copied

Move the copied shape slightly, so that it stands out.

Undo close and Delete shape were partially broken.

Mostly working, vertex highlighting needs a bit of tweaking. The code
could use a refactoring as well.

Also change the way vertices are drawn (fill color).

Remove some duplicated code.

Also switch to round nodes, they seem more appealing.