Re-organize the directories. The main purpose of
	this change is to remove CORBA code and references
	that are no longer used.

	* atk-adaptor/
	Code here used to live in libspi and atk-bridge.

	* droute/
	The droute module has been moved from libspi to
	its own directory.

	* spi-common
	Code and definitions common to registryd and
	the atk-adaptor. Mostly moved from libspi/dbus.c
	and accessible.h.

	* cspi/
	Removed for the moment. Will have to be
	mostly rewritten for D-Bus.