* tools/dbus-launch.c (print_variables): if no syntax is given,
	don't print something that's sort-of-half-sh-syntax, just print
	a plain key-value pairs thing.

	* tools/dbus-launch-x11.c: use machine ID rather than hostname for
	the local machine representation (but still have the hostname in
	the display). Remove the hostname from the display if it is
	localhost. Change session files to be named
	~/.dbus/session-bus/machine-display. Change X atoms to be
	underscore-prefixed so nobody whines about ICCCM compliance.
	Otherwise name them the same as the env variables.
	Change session file format to include key-value pairs and an
	explanatory comment. Keys are the same as the env variables.
	(set_address_in_x11): X property format can't depend on
	sizeof(pid_t) on a particular machine, fix to always be 32 bits

	* tools/dbus-launch.c: make --autolaunch take a machine id
	argument. If --autolaunch is used with a program to run, complain
	for now (but add a FIXME). Also, don't look for existing bus if
	there's a program to run (but add a FIXME).

	* dbus/dbus-sysdeps-unix.c (_dbus_get_autolaunch_address): pass
	machine uuid to dbus-launch (avoids linking dbus-launch to libdbus
	just to get this, and avoids duplicating uuid-reading code).

	* tools/dbus-launch.1: clarify various things