App: properties, add vacuum permittivity

src/App/Application.cpp

@@ -1701,6 +1701,7 @@ void Application::initTypes(void)
     App ::PropertyAcceleration      ::init();
     App ::PropertyForce             ::init();
     App ::PropertyPressure          ::init();
+    App ::PropertyVacuumPermittivity::init();
     App ::PropertyInteger           ::init();
     App ::PropertyIntegerConstraint ::init();
     App ::PropertyPercent           ::init();

src/App/PropertyUnits.cpp

@@ -330,3 +330,14 @@ PropertyForce::PropertyForce()
     setUnit(Base::Unit::Force);
 }
 
+//**************************************************************************
+//**************************************************************************
+// PropertyVacuumPermittivity
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertyVacuumPermittivity, App::PropertyQuantity)
+
+PropertyVacuumPermittivity::PropertyVacuumPermittivity()
+{
+    setUnit(Base::Unit::VacuumPermittivity);
+}

src/App/PropertyUnits.h

@@ -235,6 +235,17 @@ public:
     virtual ~PropertyForce(){}
 };
 
+/** VacuumPermittivity property
+ * This is a property for representing vacuum permittivity. It is basically a float
+ * property. On the Gui it has a quantity like s^4*A^2 / (m^3*kg).
+ */
+class AppExport PropertyVacuumPermittivity: public PropertyQuantity
+{
+    TYPESYSTEM_HEADER();
+public:
+    PropertyVacuumPermittivity(void);
+    virtual ~PropertyVacuumPermittivity(){}
+};
 
 } // namespace App