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.

src/osgPlugins/osg/Geometry.cpp

@@ -55,7 +55,7 @@ bool Geometry_readLocalData(Object& obj, Input& fr)
 
         while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)
         {
-            if (!Primitive_readLocalData(fr,geom)) ++fr;
+            if (!Primitive_readLocalData(fr,geom)) fr.advanceOverCurrentFieldOrBlock();
         }
 
         ++fr;