Add comma to every three digits with num of files
Misc, just easier to read.
Example:
>>> Processing gnome
Requesting https://download.gnome.org/README?mirrorstats ...
Mirrorbits version: v0.5.1-63-g0318e9b
Number of mirrors : 28
Requesting rsync://mirrors.dotsrc.org/gnome/ ...
Number of files: 196,444