GitLab

The class is renamed to "SessionHelper" and moved to
"agkyra.protocol". It uses the session database to get information
about the status of the protocol server.

The session database is used to store the address and ui_id of the
protocol server as well as a time stamp. The helper uses this
information to resolve if the protocol server is active. If the
server is active, the helper assumes there is a session running and
allows the client to use the session credentials to connect to it.
Otherwise, it generates new session credentials and offers the
ability to start a protocol server.

The GUI class is also modified to raise an assertion error if
another GUI is already running. This is resolved by comparing the
session information stored in the session file with the one
provided by the helper. If they match, a GUI is running, otherwise
a new GUI is launched.

The address of the HelperServer is now calculated when the class
is initialized.

If some settings are added though the GUI, the client will
save them on exit.

The mechanism is based on syncing message consumption, which works
only while the client is syncing (therefore, not in paused mode).

When GUI consumes a "SyncMessage", an "unsynced" counter is
increased, while a "AckSyncMessage" causes a "synced" counter to
increase. The two counters are pushed to GUI regularly enough.

This patch refers to the settings update on closing the settings
window.

Settings are loaded and updated in protocol.py
If the client is not ready yet, some GUI options are not gray
and unclickable until the client is ready.

The config system is an extension of the kamaki config system,
tailored to support configuration files with multiple clouds and
multiple syncs. A sync contains all the attributes needed to sync
a local directory with a remote container, included a reference to
a cloud.

The CLI is interactive and can be used to start, pause and control
the syncing process.

Also, create an application token, unique for each run