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In a few rare cases (eg, polyMesh::resetPrimitives) it has been
replaced by an autoPtr.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/test/IListStream/Test-IListStream.C

@@ -102,7 +102,14 @@ int main(int argc, char *argv[])
 
     Info<< "transfer contents to a List" << endl;
 
-    IListStream ibuf(obuf.xfer());
+    IListStream ibuf;
+
+    // Reclaim data storage from OListStream -> IListStream
+    {
+        List<char> data;
+        obuf.swap(data);
+        ibuf.swap(data);
+    }
 
     Info<< nl;
     Info<< nl << "input string:";