From Cedric Pinson, Traverse StripAction instead of applying, this fix the execution of FrameCallback in BlendIn, BlendOut and AnimationAction\nFix warning of osgAnimation::StatsHandler\nFix crash when running example osganimationtimeline without nathan.osg in OSG_FILE_PATH or with bad file

include/osgAnimation/Action

@@ -194,6 +194,8 @@ namespace osgAnimation
         void setLoop(unsigned int loop);
         void computeWeightAndUpdateAnimation(unsigned int frame);
 
+        void traverse(ActionVisitor& visitor);
+
     protected:
         typedef std::pair<unsigned int, osg::ref_ptr<BlendOut> > FrameBlendOut;
         osg::ref_ptr<BlendIn> _blendIn;

include/osgAnimation/ActionVisitor

@@ -44,7 +44,7 @@ namespace osgAnimation
         META_ActionVisitor(osgAnimation, ActionVisitor);
         void traverse(Action& visitor);
 
-        void pushFrameActionOnStack(FrameAction& fa);
+        void pushFrameActionOnStack(const FrameAction& fa);
         void popFrameAction();
 
         void pushTimelineOnStack(Timeline* tm);
@@ -71,7 +71,7 @@ namespace osgAnimation
         UpdateActionVisitor();
         void setFrame(unsigned int frame) { _frame = frame;}
 
-        bool isActive() const;
+        bool isActive(Action& action) const;
         unsigned int getLocalFrame() const;
 
         void apply(Timeline& action);