Saving config to calibrator's generic format and restoring calibration from this file

New parameters is: --output-type calibrator, --restore config

This can be useful in case when I don't have access to xorg.conf. So now I can save calibration config to file:
```bash
xinput_calibrator --output-type calibrator --output-filename calibration.conf
```
later I can restore calibration:
```bash
xinput_calibrator --restore calibration.conf
```