Now `kx' prints out the values of those two variables and then goes to
the background to enable some script to set these on the other host.
(start_session): New function that adds a local cookie before sending
the rest of the connection to the local X-server.
(main): Also recognize "unix" as a local DISPLAY.
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@731 ec53bebd-3082-4978-b11e-865c3cabbd6b
