Move FWRETRACT defaults to configuration_adv.h

Marlin/Configuration_adv.h

 // the moves are than replaced by the firmware controlled ones.
 
 // #define FWRETRACT  //ONLY PARTIALLY TESTED
-#define MIN_RETRACT 0.1 //minimum extruded mm to accept a automatic gcode retraction attempt
-
+#ifdef FWRETRACT
+  #define MIN_RETRACT 0.1                //minimum extruded mm to accept a automatic gcode retraction attempt
+  #define RETRACT_LENGTH 3               //default retract length (positive mm)
+  #define RETRACT_FEEDRATE 80*60         //default feedrate for retracting
+  #define RETRACT_ZLIFT 0                //default retract Z-lift
+  #define RETRACT_RECOVER_LENGTH 0       //default additional recover length (mm, added to retract length when recovering)
+  #define RETRACT_RECOVER_FEEDRATE 8*60  //default feedrate for recovering from retraction
+#endif
 
 //adds support for experimental filament exchange support M600; requires display
 #ifdef ULTIPANEL

Marlin/Marlin_main.cpp

 #ifdef FWRETRACT
   bool autoretract_enabled=true;
   bool retracted=false;
-  float retract_length=3, retract_feedrate=17*60, retract_zlift=0.8;
-  float retract_recover_length=0, retract_recover_feedrate=8*60;
+  float retract_length = RETRACT_LENGTH;
+  float retract_feedrate = RETRACT_FEEDRATE;
+  float retract_zlift = RETRACT_ZLIFT;
+  float retract_recover_length = RETRACT_RECOVER_LENGTH;
+  float retract_recover_feedrate = RETRACT_RECOVER_FEEDRATE;
 #endif
 
 #ifdef ULTIPANEL
     }
   } //retract
 #endif //FWRETRACT
+
 void process_commands()
 {
   unsigned long codenum; //throw away variable