Tom Honour

Errors like `SWT SessionManagerDBus: Failed to connect to org.xfce.SessionManager` are usually the result of failing to run Archi headless. Check out this: https://github.com/archimatetool/archi/wiki/Archi-Command-Line-Interface#running-on-linux-without-graphics-headless .

Thank you for your changes! I've applied them to the file