* dbus/dbus-connection.c: (dbus_connection_send_message):
	Add a new client_serial parameter.

	(dbus_connection_send_message_with_reply):
	Remove a @todo since we've implemented the blocking function.

	(dbus_connection_send_message_with_reply_and_block):
	New function that sends a message and waits for a reply and
	then returns the reply.

	* dbus/dbus-connection.h:
	Add new functions.

	* dbus/dbus-errors.c: (dbus_result_to_string):
	* dbus/dbus-errors.h:
	Add new DBUS_RESULT.

	* dbus/dbus-message-internal.h:
	* dbus/dbus-message.c: (_dbus_message_get_reply_serial),
	(_dbus_message_set_sender), (dbus_message_write_header),
	(dbus_message_new_reply), (decode_header_data),
	(_dbus_message_loader_return_buffer), (_dbus_message_test):
	* dbus/dbus-message.h:
	Add new functions that set the reply serial and sender.
	Also marshal and demarshal them correctly and add test.

	* dbus/dbus-protocol.h:
	Add new DBUS_MESSAGE_TYPE_SENDER.

	* glib/dbus-glib.h:
	* glib/dbus-gmain.c: (watch_callback), (free_callback_data),
	(add_watch), (remove_watch), (add_timeout), (remove_timeout),
	(dbus_connection_hookup_with_g_main):
	* glib/test-dbus-glib.c: (main):
	Rewrite to use GIOChannel and remove the GSource crack.

	* test/echo-client.c: (main):
	* test/watch.c: (check_messages):
	Update for changed APIs