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- Add ``dbus_start_session`` configuration value for specifying the
command to start a session bus. The default is to invoke
``dbus-daemon`` directly, so ``dbus-launch`` is no longer needed
(but is still supported for now).
- Check for ``$XDG_RUNTIME_DIR/bus`` before starting a session bus.
- Update installation dependencies.
- Improve log messages if search is not supported.