feat!: Add log-level-logfile and log-level-dryrun options; remove quiet options

[aawsome]

Note: The new log-level-* options change the default behavior of log levels when using a log file.

Previous behavior: log-level gives the log-level used in the config file; only warnings/errors are logged to stderr New behavior: logging to log-file is determined by log-level-logfile; logging to stderr is determined by log-level.

Instead of using the quiet options for backup and forget, users should now fine-tune their logging-options.

[aawsome]

see also #1562