Fix G26 Circle Drawing. Add Default Extrusion Settings (#8313)

- Fix G26 Circle Drawing.
- Add default extrusion settings so machine can print lines on print bed
- Yet to be done: Get LCD Menu's to use these settings.

Marlin/Configuration_adv.h

@@ -256,6 +256,29 @@
 
 //#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.
 
+// Dual X Steppers
+// Uncomment this option to drive two X axis motors.
+// The next unused E driver will be assigned to the second X stepper.
+//#define X_DUAL_STEPPER_DRIVERS
+#if ENABLED(X_DUAL_STEPPER_DRIVERS)
+  // Set true if the two X motors need to rotate in opposite directions
+  #define INVERT_X2_VS_X_DIR true
+#endif
+
+// Dual Y Steppers
+// Uncomment this option to drive two Y axis motors.
+// The next unused E driver will be assigned to the second Y stepper.
+//#define Y_DUAL_STEPPER_DRIVERS
+#if ENABLED(Y_DUAL_STEPPER_DRIVERS)
+  // Set true if the two Y motors need to rotate in opposite directions
+  #define INVERT_Y2_VS_Y_DIR true
+#endif
+
+// A single Z stepper driver is usually used to drive 2 stepper motors.
+// Uncomment this option to use a separate stepper driver for each Z axis motor.
+// The next unused E driver will be assigned to the second Z stepper.
+//#define Z_DUAL_STEPPER_DRIVERS
+
 /**
  * Dual Steppers / Dual Endstops
  *