Round distances

[lederer]

This is an extreme example, but it helps illustrate the point:

Here's an initial stab at rounding logic:

• > 3 miles: round to nearest mile
• 1 – 3 miles: round to nearest 1/2 mile
• 1/4 mile – 1 mile: round to nearest 1/4 mile
• < 1/4 mile: display as (rounded) feet