Round relay bandwidths in bandwidth files
Torflow rounds raw bandwidths to 3 significant figures, and increases 0 bandwidths to 1:
sbws must round to 3 (or fewer) significant figures, so that consensus diffs are still efficient.
I suggest 2 significant figures, because the largest error is 5% at 1.5*10^n^ (for example: (105-100)/100 = 5%).
Bandwidth authorities already vary from each other by 25-50%: https://trac.torproject.org/projects/tor/ticket/25459#comment:5
And network load varies each day (from what I remember, my guards and exits used to vary by at least 10% every day).
I think sbws should also increase 0 bandwidths to 1.
We also have to update the spec, I'll open a child ticket.