* doc/dbus-specification.xml: document the GUID thing

	* dbus/dbus-server.c (_dbus_server_init_base): initialize a
	globally unique ID for the server, and put a "guid=hexencoded"
	field in the address

	* dbus/dbus-bus.c: fix missing #include of dbus-threads-internal.h

	* dbus/dbus-message.c: ditto

	* dbus/dbus-dataslot.c: ditto

	* dbus/dbus-list.c: ditto

	* dbus/dbus-internals.h: wait, just include
	dbus-threads-internal.h here

	* dbus/dbus-string.c (_dbus_string_copy_to_buffer): move back for
	use in main library

	* dbus/dbus-sysdeps.c (_dbus_generate_random_bytes_buffer): new function