Syncthing Gtk-based graphical interface

Graphical user interface with notification area icon for Syncthing based on GTK+ and Python. Supported Syncthing features: * Everything what WebUI can display. * Adding / editing / deleting nodes. * Adding / editing / deleting repositories. * Restart / shutdown server. * Editing daemon settings. Additional features: * First run wizard for initial configuration. * Running Syncthing daemon in background. * Half-automatic setup for new nodes and repositories. * Filesystem watching and instant synchronization using inotify. * Caja, Nautilus, and Nemo file managers integration. * Desktop notifications.