Merge #32

32: Report 1-based indices in Error's Display impl r=lnicola a=CAD97

This matches every (mainstream) text editor's use of the line:column format.

I actually lost some time trying to figure out why it was complaining about an empty line before I realized why 😅

I kept `Location` 0-based and translated just at the point of display, as that was a much less invasive change.

Co-authored-by: Christopher Durham <cad97@cad97.com>