Fixed merge conflicts

Marlin/Configuration_adv.h

@@ -150,6 +150,21 @@
   #define EXTRUDERS 1
 #endif
 
+// Same again but for Y Axis.
+//#define Y_DUAL_STEPPER_DRIVERS
+
+// Define if the two Y drives need to rotate in opposite directions
+#define INVERT_Y2_VS_Y_DIR true
+
+#ifdef Y_DUAL_STEPPER_DRIVERS
+  #undef EXTRUDERS
+  #define EXTRUDERS 1
+#endif
+
+#ifdef Z_DUAL_STEPPER_DRIVERS && Y_DUAL_STEPPER_DRIVERS
+  #error "You cannot have dual drivers for both Y and Z"
+#endif 
+
 // Enable this for dual x-carriage printers. 
 // A dual x-carriage design has the advantage that the inactive extruder can be parked which
 // prevents hot-end ooze contaminating the print. It also reduces the weight of each x-carriage