Made the more of the OSG's referenced object desctructors protected to ensure

that they arn't created on the stack inappropriately.

Split the implemention of Matrix up so that it is a simple no referenced counted
class and can be safefly created on the stack.  To support referenced counting a
seperate subclass now exists, this is RefMatrix which inherits from both Matrix and
Object.

include/osg/FrameStamp

@@ -28,7 +28,6 @@ class SG_EXPORT FrameStamp : public Referenced
 
         FrameStamp();
         FrameStamp(const FrameStamp& fs);
-        ~FrameStamp();
         
         FrameStamp& operator = (const FrameStamp& fs);
         
@@ -40,9 +39,14 @@ class SG_EXPORT FrameStamp : public Referenced
         
         void setCalendarTime(const tm& calendarTime);
         void getCalendarTime(tm& calendarTime) const;
-        
+
+        // keep public to allow it to be permit allocation which is 
+        // not on the heap used osgcluster
+        virtual ~FrameStamp();
+
     protected:
     
+
         // note no dynamic memory is used so that data can be passed
         // via a simple memory copy or within a data packet across
         // the network.