Pretty up report format

Because I'm a bad person, this proposed merge mixes several things up:

• Force font to be sans-serif. (Most people probably won't see any change!)
• Display statistics in a table instead of a list.
• Show statistics that are calculated for each file on a single line instead of two different lines.
• Display integers with thousands separators (so instead of "1234567" you'll see "1,234,567")
• Zebra stripe tables

Merge is available as !9 (merged)

Before	After