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In a few rare cases (eg, polyMesh::resetPrimitives) it has been
replaced by an autoPtr.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

@@ -214,9 +214,9 @@ int main(int argc, char *argv[])
             runTime.timeName(),
             runTime
         ),
-        xferCopy(mesh.points()),   // could we safely re-use the data?
-        xferCopy(mesh.faces()),
-        xferCopy(mesh.cells())
+        pointField(mesh.points()),  // Could we safely re-use the data?
+        faceList(mesh.faces()),
+        cellList(mesh.cells())
     );
 
     // Add the boundary patches