Reformat warning message

amdis/datatransfers/SimpleDataTransfer.hpp

@@ -44,7 +44,8 @@ public:
   SimpleDataTransfer()
   {
     test_warning(Dune::Capabilities::hasSingleGeometryType<typename Basis::GridView::Grid>::v,
-                 "Your grid might have multiple geometry types. This will lead to problems in the SimpleDataTransfer. "
+                 "Your grid might have multiple geometry types. "
+                 "This will lead to problems in the SimpleDataTransfer. "
                  "If you are not sure, change to InterpolationDataTransfer.");
   }