because nmbug is tracking empty files, it often detects false positives
of renaming, like commit  e473b453a25c

In nmbug log, this is pretty confusing (although in this case, at least
those two changes are semantically related).

commit e473b453a25c072b5df67d834d822121373321f5
Author: David Bremner <david@tethera.net>
Date:   Sun Sep 25 07:54:11 2016 -0300

R100    tags/1474196252-31700-1-git-send-email-markwalters1009@gmail.com/0.23   tags/1474196252-31700-1-git-send-email-markwalters1009@gmail.com/pushed

I think it would be better to turn off rename detection completely in
nmbug log.

d