fix override warnings

src/App/DocumentObjectExtension.h

@@ -38,7 +38,7 @@ class AppExport DocumentObjectExtension : public App::Extension
 
     //The cass does not have properties itself, but it is important to provide the property access
     //functions. see cpp file for details
-    EXTENSION_PROPERTY_HEADER(App::DocumentObjectExtension );
+    EXTENSION_PROPERTY_HEADER_WITH_OVERRIDE(App::DocumentObjectExtension );
 
 public:
 
@@ -60,7 +60,7 @@ public:
     /// get called when object is going to be removed from the document
     virtual void onExtendedUnsetupObject();
   
-    virtual PyObject* getExtensionPyObject(void);
+    virtual PyObject* getExtensionPyObject(void) override;
     
     /// returns the type name of the ViewProviderExtension which is automatically attached 
     /// to the viewprovider object when it is initiated

src/App/GeoFeatureGroupExtension.h

@@ -50,12 +50,12 @@ namespace App
  */
 class AppExport GeoFeatureGroupExtension : public App::GroupExtension
 {
-    EXTENSION_PROPERTY_HEADER(App::GeoFeatureGroupExtension);
+    EXTENSION_PROPERTY_HEADER_WITH_OVERRIDE(App::GeoFeatureGroupExtension);
 
 public:
     PropertyPlacement& placement();
     
-    virtual void initExtension(ExtensionContainer* obj);
+    virtual void initExtension(ExtensionContainer* obj) override;
 
     /**
      * @brief transformPlacement applies transform to placement of this shape.
@@ -69,7 +69,7 @@ public:
     GeoFeatureGroupExtension(void);
     virtual ~GeoFeatureGroupExtension();
     
-    virtual void extensionOnChanged(const Property* p);
+    virtual void extensionOnChanged(const Property* p) override;
 
     /** Returns the geo feature group which contains this object.
      * In case this object is not part of any geoFeatureGroup 0 is returned.

src/App/GroupExtension.h

@@ -37,7 +37,7 @@ class GroupExtensionPy;
 
 class AppExport GroupExtension : public DocumentObjectExtension
 {
-    EXTENSION_PROPERTY_HEADER(App::GroupExtension);
+    EXTENSION_PROPERTY_HEADER_WITH_OVERRIDE(App::GroupExtension);
 
 public:
     /// Constructor