* dbus/Makefile.am (INCLUDES): define DBUS_COMPILATION
	so we can allow ourselves to include files directly,
	instead of having to use dbus.h

	* dbus/dbus.h: fill in

	* dbus/dbus-message.h: sketch out a sample header file.
	Include griping if you include it directly instead of
	via dbus.h

	* dbus/dbus-macros.h: new file with macros for extern "C",
	TRUE/FALSE, NULL, etc.

	* doc/file-boilerplate.c: put include guards in here