borg: 0.29.0 -> 0.30.0

Compatibility notes:

- you may need to use -v (or --info) more often to actually see
  output emitted at INFO log level (because it is suppressed at
  the default WARNING log level). See the general section in the
  usage docs.
- for borg create, you need --list (additionally to -v) to see
  the long file list (was needed so you can have e.g. --stats
  alone without the long list)
- see link below about BORG_DELETE_I_KNOW_WHAT_I_AM_DOING
  (was: BORG_CHECK_I_KNOW_WHAT_I_AM_DOING)

More: https://github.com/borgbackup/borg/blob/0.30.0/docs/changes.rst