Copter: add AC_WPNav to parameters list

ArduCopter/Parameters.h

@@ -108,6 +108,7 @@ public:
         // 100: Inertial Nav
         //
         k_param_inertial_nav = 100,
+        k_param_wp_nav = 101,
 
         // 110: Telemetry control
         //

ArduCopter/Parameters.pde

@@ -958,6 +958,10 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @Path: ../libraries/AP_InertialNav/AP_InertialNav.cpp
     GOBJECT(inertial_nav,           "INAV_",    AP_InertialNav),
 
+    //@Group: WPNAV_
+    //@Path: ../libraries/AC_WPNav/AC_WPNav.cpp
+    GOBJECT(wp_nav, "WPNAV_",       AC_WPNav),
+
     // @Group: SR0_
     // @Path: ./GCS_Mavlink.pde
     GOBJECT(gcs0,                   "SR0_",     GCS_MAVLINK),