ENH: remove reliance on the Xfer class (issue #639)

This class is largely a pre-C++11 holdover. It is now possible to
simply use move construct/assignment directly.

In a few rare cases (eg, polyMesh::resetPrimitives) it has been
replaced by an autoPtr.

applications/utilities/mesh/conversion/plot3dToFoam/plot3dToFoam.C

@@ -247,7 +247,7 @@ int main(int argc, char *argv[])
             runTime.constant(),
             runTime
         ),
-        xferMove(newPoints),
+        std::move(newPoints),
         cellShapes,
         boundary,
         patchNames,