made runout prevention independent of tempeorarily set esteps

Marlin/Configuration.h

 //#define EXTRUDER_RUNOUT_PREVENT  
 #define EXTRUDER_RUNOUT_MINTEMP 190  
 #define EXTRUDER_RUNOUT_SECONDS 60
-#define EXTRUDER_RUNOUT_EXTRUDE 10 //mm filament
-#define EXTRUDER_RUNOUT_SPEED 20  //extrusion speed
+#define EXTRUDER_RUNOUT_ESTEPS 14 //mm filament
+#define EXTRUDER_RUNOUT_EXTRUDE 100 //mm filament
+#define EXTRUDER_RUNOUT_SPEED 1500  //extrusion speed
 
 
 //===========================================================================

Marlin/Marlin.pde

      enable_e();
      float oldepos=current_position[E_AXIS];
      float oldedes=destination[E_AXIS];
-     plan_buffer_line(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]+EXTRUDER_RUNOUT_EXTRUDE, EXTRUDER_RUNOUT_SPEED*feedmultiply/60/100.0, active_extruder);
+     plan_buffer_line(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], 
+                      current_position[E_AXIS]+EXTRUDER_RUNOUT_EXTRUDE*EXTRUDER_RUNOUT_ESTEPS/axis_steps_per_unit[E_AXIS], 
+                      EXTRUDER_RUNOUT_SPEED*feedmultiply/60/100.0*EXTRUDER_RUNOUT_ESTEPS/axis_steps_per_unit[E_AXIS], active_extruder);
      current_position[E_AXIS]=oldepos;
      destination[E_AXIS]=oldedes;
      plan_set_e_position(oldepos);