Feature Request: Save automatically

[Erudition]

Instead of giving a suggestion just like xinput_calibrator does where you have to copy paste yourself, consider saving the calibration to a file in the current directory - or to the correct final directory if sudo is used.

This is more than just a convenience in my case as I'm using it on a tiny tiny raspberry pi touchscreen where the terminal doesn't even fit on the screen and I can't select all the text.