Copter: support multiple simultaneous backends

ArduCopter/Parameters.cpp

@@ -952,6 +952,10 @@ const AP_Param::Info Copter::var_info[] = {
     GOBJECT(camera_mount,           "MNT",  AP_Mount),
 #endif
 
+    // @Group: LOG
+    // @Path: ../libraries/DataFlash/DataFlash.cpp
+    GOBJECT(DataFlash,           "LOG",  DataFlash_Class),
+
     // @Group: BATT
     // @Path: ../libraries/AP_BattMonitor/AP_BattMonitor.cpp
     GOBJECT(battery,                "BATT",         AP_BattMonitor),

ArduCopter/Parameters.h

@@ -356,6 +356,7 @@ public:
         k_param_rpm_sensor,
         k_param_autotune_min_d, // 251
         k_param_pi_precland,    // 252
+        k_param_DataFlash = 253, // 253 - Logging Group
 
         // 254,255: reserved
     };