expose Geometry::getTag to Python

src/Mod/Part/App/GeometryPy.xml

@@ -55,5 +55,11 @@ means that it is not part of a later built shape.</UserDocu>
       </Documentation>
       <Parameter Name="Construction" Type="Boolean"/>
     </Attribute>
+    <Attribute Name="Tag" ReadOnly="true">
+      <Documentation>
+        <UserDocu>Gives the tag of the geometry as string.</UserDocu>
+      </Documentation>
+      <Parameter Name="Tag" Type="String"/>
+    </Attribute>
   </PythonExport>
 </GenerateModel>

src/Mod/Part/App/GeometryPyImp.cpp

@@ -35,6 +35,8 @@
 # include <Standard_Failure.hxx>
 #endif
 
+#include <boost/uuid/uuid_io.hpp>
+
 #include <Base/GeometryPyCXX.h>
 #include <Base/Matrix.h>
 #include <Base/MatrixPy.h>
@@ -221,6 +223,12 @@ void  GeometryPy::setConstruction(Py::Boolean arg)
         getGeometryPtr()->Construction = arg;
 }
 
+Py::String GeometryPy::getTag(void) const
+{
+    std::string tmp = boost::uuids::to_string(getGeometryPtr()->getTag());
+    return Py::String(tmp);
+}
+
 PyObject *GeometryPy::getCustomAttributes(const char* /*attr*/) const
 {
     return 0;