Seems vaguely sensible. Haven't tested because I'm on a plane.
Trying to get more sensible defaults for people who like to think about graphstates rather than circuits. Repsponse to issue #4: [Link](https://github.com/peteshadbolt/abp/issues/4)
- `GraphState.copy()` - `measure_x` etc. - `measure(detail=True)` - Better documentation on `remove_vop` and `act_local_rotation`