Correctly halt the start sequence on APIError exceptions

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>
Add -c option as a shell completion helper

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>
More snug fit for narrow terminals

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>