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In a few rare cases (eg, polyMesh::resetPrimitives) it has been
replaced by an autoPtr.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

@@ -1880,7 +1880,7 @@ int main(int argc, char *argv[])
             }
         }
     }
-    const primitiveFacePatch extrudePatch(zoneFaces.xfer(), mesh.points());
+    const primitiveFacePatch extrudePatch(std::move(zoneFaces), mesh.points());
 
 
     Pstream::listCombineGather(isInternal, orEqOp<bool>());
@@ -2405,10 +2405,7 @@ int main(int argc, char *argv[])
             IOobject::AUTO_WRITE,
             false
         ),
-        xferCopy(pointField()),
-        xferCopy(faceList()),
-        xferCopy(labelList()),
-        xferCopy(labelList()),
+        Zero,
         false
     );