[Borgbackup] Some minor issues

[Hans-Peter Jansen]

Hi Thomas,
hello to the collective,

in my setup, I'm backing up many similar VMs, which is a perfect ground for  
borgs excelling deduplication feature. Since they're hosted on different 
machines and backup is triggered with cron, I'm using a single repo and

 	BORG_RELOCATED_REPO_ACCESS_IS_OK=yes

to harvest the maximum result. Of course, it took two attempts to get this 
working unattended. A quick googling revealed the environmental intervention. 
This deserves a note in the documentation of remote backups, probably with 
mentioning the reasons.

What's still a little disturbing, is this:
Warning: The repository at location /backup/borg was previously located at 
ssh://user@host/backup/borg
Do you want to continue? [yN] 

Given the answer is defined by environment, what's the reason the print the 
question "Do you.."? Since no input is given anyway, it results in a missing 
newline, which distorts the output. I would even argue, that the warning 
itself isn't justified due to being actively approved beforehand, unless 
-v is also given. It appears on every backup run and ever recurring warnings 
generally doesn't improve average users confidence in the system.

While at it, I noticed, that providing --stats on the command line doesn't 
produce any output without also giving -v, which generates other output, that 
is less interesting for unattended runs:

Synchronizing chunks cache...
Archives: 10, w/ cached Idx: 0, w/ outdated Idx: 0, w/o cached Idx: 10.
....

If the stats output was requested explicitly, it should be done, no matter, 
what other options were given or not.

Cheers,
Pete