COM: OTB-134/OGR -> (*layer.begin())[0].GetValue<int>() now works

Code/UtilitiesAdapters/OGRAdapters/otbOGRLayerWrapper.h

@@ -300,8 +300,8 @@ public:
     Value & dereference() const
       { return m_Crt; }
 
-    otb::ogr::Layer * m_Layer;
-    otb::ogr::Feature m_Crt;
+    otb::ogr::Layer         * m_Layer;
+    otb::ogr::Feature mutable m_Crt;
     };
 
   template <class> friend class feature_iter;

Testing/Code/UtilitiesAdapters/OGRAdapters/otbOGRDataSourceWrapperNew.cxx

@@ -227,6 +227,8 @@ BOOST_AUTO_TEST_CASE(Add_n_Read_Fields)
   f0.SetValue(42);
   BOOST_ASSERT(f0.HasBeenSet());
   BOOST_CHECK_EQUAL(f0.GetValue<int>(), 42);
+  BOOST_CHECK_EQUAL(g0[0].GetValue<int>(), 42);
+  BOOST_CHECK_EQUAL((*l.begin())[0].GetValue<int>(), 42);
   // BOOST_CHECK_assert_FAILS(f0.GetValue<double>(), itk::ExceptionObject);
 
   ogr::Field f1 = g0["OFTReal"];