Consider moving some config.ini options into an admin panel in app
Fred (from Framasoft) asked me if we had an issue for this, for configuring emails once the app has started. I think that's a great idea! In fact, it would probably help people using YunoHost, because it means they could configure their own email server with Kresus (and reuse their email provider's).
If you extend the idea, there aren't so many config.ini options that are bound to live forever in this file (except for the subdirectory path, and maybe the full URL if we ever add it). So we could have an admin panel which allows you to set (and try!) these configuration entries.