Update to 0.78.2
    
    - tweak initialization so that we set up for providing our D-Bus API before we
      register our name with the bus, so that we can handle any requests that
      arrive before the acknowledgement of that registration
    - on systems that run systemd, add the right data file so that the service gets
      started when someone tries to talk to the daemon (ticket #38)
    - correctly check for error responses when sending GetCAChain requests to SCEP
      servers