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In a few rare cases (eg, polyMesh::resetPrimitives) it has been
replaced by an autoPtr.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

@@ -652,9 +652,7 @@ int main(int argc, char *argv[])
                             runTime,
                             IOobject::NO_READ
                         ),
-                        xferCopy(pointField()),
-                        xferCopy(faceList()),
-                        xferCopy(cellList())
+                        Zero
                     )
                 );