Position line and column should start at 0, not 1.

This has been super inconvenient for me on several occasions.

https://www.cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html

This would be an easy change to make, but the hard part would be not breaking downstream dependents.