0.3.4 (build 1)
User can add mileage cost in invoice. (In progress.)
—Minor UI changes: alignment, font size.
—Settings-side:
  —Mileage Calc: currently selected type is highlighted.
  —Flat rate: user can enter an amount.
—Next: save values to disk.
0.3.4 (build 2)
User can add mileage cost in invoice. (In progress.)
—Current mileage-type saved to disk.
—Flat-rate info: saved to disk.
—Next: implement “cost per mile.”