Fix a FlightPlan lifetime issue.

Route-manager was explicitly deleting its FP, which was incorrect.
Switch to correct use of SGSharedPtr to refer to flight plans.

Thanks to Roland Haeder for catching this.

src/Autopilot/route_mgr.cxx

@@ -401,12 +401,12 @@ bool FGRouteMgr::loadRoute(const SGPath& p)
   return true;
 }
 
-FlightPlan* FGRouteMgr::flightPlan() const
+FlightPlanRef FGRouteMgr::flightPlan() const
 {
   return _plan;
 }
 
-void FGRouteMgr::setFlightPlan(FlightPlan* plan)
+void FGRouteMgr::setFlightPlan(const FlightPlanRef& plan)
 {
   if (plan == _plan) {
     return;
@@ -414,7 +414,6 @@ void FGRouteMgr::setFlightPlan(FlightPlan* plan)
   
   if (_plan) {
     _plan->removeDelegate(this);
-    delete _plan;
     active->setBoolValue(false);
   }
   

src/Autopilot/route_mgr.hxx

@@ -55,8 +55,8 @@ public:
          
   int currentIndex() const;
   
-  void setFlightPlan(flightgear::FlightPlan* plan);
+  void setFlightPlan(const flightgear::FlightPlanRef& plan);
-  flightgear::FlightPlan* flightPlan() const;
+  flightgear::FlightPlanRef flightPlan() const;
   
   void clearRoute();
   
@@ -104,7 +104,7 @@ private:
     bool commandDefineUserWaypoint(const SGPropertyNode* arg);
     bool commandDeleteUserWaypoint(const SGPropertyNode* arg);
     
-    flightgear::FlightPlan* _plan;
+    flightgear::FlightPlanRef _plan;
   
     time_t _takeoffTime;
     time_t _touchdownTime;

src/Navaids/FlightPlan.cxx

@@ -91,6 +91,11 @@ FlightPlan::~FlightPlan()
       delete cur;
     }
   }
+    
+// delete legs
+    BOOST_FOREACH(Leg* l, _legs) {
+        delete l;
+    }
 }
   
 FlightPlan* FlightPlan::clone(const string& newIdent) const
@@ -1193,18 +1198,16 @@ FlightPlan::Delegate::Delegate() :
   _deleteWithPlan(false),
   _inner(NULL)
 {
-  
 }
 
 FlightPlan::Delegate::~Delegate()
-{
+{  
-  
 }
 
 void FlightPlan::Delegate::removeInner(Delegate* d)
 {
   if (!_inner) {
-    return;
+      throw sg_exception("FlightPlan delegate not found");
   }
   
   if (_inner == d) {

src/Navaids/FlightPlan.hxx

@@ -31,7 +31,10 @@ namespace flightgear
 {
 
 class Transition;
-
+class FlightPlan;
+    
+typedef SGSharedPtr<FlightPlan> FlightPlanRef;
+    
 class FlightPlan : public RouteBase
 {
 public: