The default directory of the sqlite db has now been changed depending of
the user who executes flucky.
The place where the sqlite db will be stored is unchanged for the root
user, but for all other users the sqlite db will now be created to
~/.cache/flucky
Changes:
- Renamed storage endpoint into dsn (data source name).
- Add additional dsn fallback property. This dsn will be used in futes
to store informations, if the main dsn backend does not work
correctly. For example, if no connection can be established over the
network to a database.
