add check-depth-error script and bagfile

## every depth

```bash
python draw-graph-from-rosbag.py test.bag
```

## every u / v

This one use a Bayesian Curve Fitting algorithm based on http://aidiary.hatenablog.com/entry/20100404/1270359720

```bash
python draw-graph-from-rosbag.py zikken.bag -t 1
```