PartDesign/Gui: add origin sizing and rework datums sizing

src/Mod/Part/App/BodyBase.h

@@ -59,6 +59,16 @@ public:
      */
     App::PropertyLink BaseFeature;
 
+    /// Returns all Model objects prepanded by BaseFeature (if any)
+    std::vector<App::DocumentObject *> getFullModel () {
+        std::vector<App::DocumentObject *> rv;
+        if ( BaseFeature.getValue () ) {
+            rv.push_back ( BaseFeature.getValue () );
+        }
+        std::copy ( Model.getValues ().begin (), Model.getValues ().end (), std::back_inserter (rv) );
+        return rv;
+    }
+
     // These methods are located here to avoid a dependency of ViewProviderSketchObject on PartDesign
     /// Remove the feature from the body
     virtual void removeFeature(App::DocumentObject* feature){}

src/Mod/Part/App/DatumFeature.cpp

@@ -102,3 +102,7 @@ TopoDS_Shape Datum::getShape() const
     sh.setPlacement(Placement.getValue());
     return sh._Shape;
 }
+
+Base::Vector3d Datum::getBasePoint () const {
+    return Placement.getValue().getPosition();
+}

src/Mod/Part/App/DatumFeature.h

@@ -54,6 +54,8 @@ public:
     /// Return a shape including Placement representing the datum feature
     TopoDS_Shape getShape() const;
 
+    /// Returns a point of the feature it counts as it's base
+    virtual Base::Vector3d getBasePoint () const;
 protected:
     void onChanged (const App::Property* prop);
     void onDocumentRestored();