Added new property type: App::PropertyVectorDistance

This works exactly as a normal PropertyVector, but it
uses the Units-enabled GUI editor instead.

src/App/PropertyGeo.cpp

@@ -175,6 +175,27 @@ void PropertyVector::Paste(const Property &from)
 }
 
 
+//**************************************************************************
+// PropertyVectorDistance
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertyVectorDistance , App::PropertyVector);
+
+//**************************************************************************
+// Construction/Destruction
+
+
+PropertyVectorDistance::PropertyVectorDistance()
+{
+
+}
+
+PropertyVectorDistance::~PropertyVectorDistance()
+{
+
+}
+
+
 //**************************************************************************
 // PropertyVectorList
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++