No progress if executed over ssh

[jason-adnuntius]

If I run s4cmd via ssh I see no progress, but if I go in and manually disable these lines:

if not (sys.stdout.isatty() and sys.stderr.isatty()):
    return

I see the progress just fine. Wondering if it would be possible to introduce a --progress option to force progress even if sys.stdout.isatty() is False.

[jason-adnuntius]

I was going to have a go myself, but I see that progress is not inside any class