Auto-detect header?

I'm not quite sure how you would detect it but, if it has one, displaying the CSV's header would be nice.

Maybe add a pencil-everything button that would copy everything in row 1 into the A/B/C/D header displayed now?

And maybe if there are columns that are 100% digits except for the first row, you could just do this automatically?

Looking forward to auto-adjusting table widths!