Added Reversed button to Pocket UI if the sketch plane is a datum plane

src/Mod/PartDesign/App/FeatureSketchBased.cpp

@@ -930,6 +930,14 @@ bool SketchBased::isParallelPlane(const TopoDS_Shape& s1, const TopoDS_Shape& s2
     return false;
 }
 
+bool SketchBased::isSupportDatum() const
+{
+    Part::Feature* SupportObject = getSupport();
+    if (SupportObject == NULL)
+        throw Base::Exception("No support in Sketch!");
+    return isDatum(SupportObject);
+}
+
 TopoDS_Shape SketchBased::refineShapeIfActive(const TopoDS_Shape& oldShape) const
 {
     Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter()