bugfix: size of oldCritical_ was too large. Thanks to Jonathan Youett for the patch

[[Imported from SVN: r3115]]

dune-solvers/iterationsteps/mmgstep.hh

@@ -52,7 +52,7 @@ public:
                             int numLevels) 
     {
         MultigridStep<OperatorType, DiscFuncType>::setProblem(mat,x,rhs, numLevels);
-        oldCritical.resize(x.size()*dim, false);
+        oldCritical.resize(x.size(), false);
     }
     
     virtual void iterate();