better debug logs for remesh

hysop/operator/tests/test_directional_advection.py

@@ -241,7 +241,7 @@ class TestDirectionalAdvectionOperator(object):
                                     if (max_di>max_tol):
                                         print '\nFATAL ERROR: Could not match other implementation results.'
                                         print '\nComparisson failed at step {} and component {}:'.format(k,i)
-                                        for (j,dv) in dvin.nd_iter():
+                                        for (j,dv) in enumerate(dvin):
                                             print 'VELOCITY INPUT {}'.format(DirectionLabels[j])
                                             print dv.sdata[dv.compute_slices]
                                         print 'SCALAR INPUT'