Add file-sharing application Coquelicot to FreedomBox

- Add settings in Service View
- Fixes for maximum file setting
- Don't allow negative values for max. file size in UI
- Minor text changes to django messages
- Minor correction to maximum file size calculation
- Rename apache conf file to coquelicot-freedombox.conf
- Remove all hacks to adjust file size.
- Fix permissions issues for settings file
- Show status block in UI
- try-restart on settings change instead of restart

Signed-off-by: Joseph Nuthalapati <njoseph@thoughtworks.com>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>