Added single threaded version of the derivative for the Ls vectorised DWF

lib/qcd/hmc/integrators/Integrator.h

@@ -114,6 +114,7 @@ class Integrator {
     // Fundamental updates, include smearing
     for (int a = 0; a < as[level].actions.size(); ++a) {
       Field force(U._grid);
+      conformable(U._grid, Mom._grid);
       Field& Us = Smearer.get_U(as[level].actions.at(a)->is_smeared);
       as[level].actions.at(a)->deriv(Us, force);  // deriv should NOT include Ta