```
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.

* Group operations on shapes

* flake8 fixes