From Wang Rui, "The new osgShadow and osgFX serializers are attached, and some

modifications of the osgShadow header naming styles as well. The
osgDB::Serializer header is also changed to add new Vec2 serializer
macros because of the needs of osgShadow classes. It should compile
fine on both Windows and Linux. But I have only done a few tests to
generate .osgb, .osgt and .osgx formats with these new wrappers."

include/osgShadow/DebugShadowMap

@@ -69,7 +69,7 @@ class OSGSHADOW_EXPORT DebugShadowMap : public ViewDependentShadowTechnique
         void setDebugDraw( bool draw ) { _doDebugDraw = draw; }
 
         /** Tell if debuging hud & rendering of debug volumes is active */
-        bool getDebugDraw( void )      { return _doDebugDraw; }
+        bool getDebugDraw( void ) const { return _doDebugDraw; }
 
     protected:
         /** Classic protected OSG destructor */