Add --stats option

[htower]

No description provided.

[htower]

New option may be useful when we don't want to see huge/complete file list produced by --verbosity 1 option. Usage example:

borgmatic --create --stats --progress

[witten]

Thanks so much for doing this, but it looks like another contributor beat you to it! See here: https://projects.torsion.org/witten/borgmatic/pulls/115 .. Also, more discussion on this ticket: https://projects.torsion.org/witten/borgmatic/issues/100

I should've been faster on the draw on processing pull requests. My apologies on that.

[htower]

Hi, Dan

Heh - you are right, pushed commit looks more complete than my and it will be requested earlier. Thanks for you answer and sorry for my inattention - I forgot about your primary source hosting (torsion.org) and don't check already present pull requests.

With best regards,
Anton.

[witten]

No worries.. I accept pull requests both on torsion.org and here on GitHub because some folks have a preference for one or the other.