disable X2 support until we get it working
change axis inversion settings and add toolhead offsets

Older bukobots being upgraded past this version will need to have some
of their motor wires flipped and Duos will need to have their extruders
switched (the right extruder is now always the primary. All motors
should now have the smooth side up. This also prepares us for a move to
polarized motor connectors.
update config revision date