Restore synaptics pad mode on module unload.
	Support Synaptics touchpads with multiple buttons.
	Make Synaptics touchpad support optional.
	Add passthrough support for Synaptics touchpads. [Dmitry]
	Add support for old Synaptics protocol.
	Set mode byte correctly for old Synaptics pads.
	Fix multibutton support of Synaptics pads.