Actually cleanly shutdown processes this time instead of still quitting them via screen

Two mistakes - firstly, I failed to realize that the quit command would actually be sent to the screen program (where it is a valid command) and not to the input terminal
Secondly, failed to realize that stop-start-daemon --stop actually signal quits and doesn't execute the command that it is given, so need to use su instead
Introduce these changes as v0.2