adapted Vec to FieldVector in some places

[[Imported from SVN: r1582]]

grid/albertagrid/albertagrid.cc

@@ -4104,18 +4104,18 @@ namespace Dune
           macroVertices_[dof] = 1;
           for(int j=0; j<dimworld; j++)
           {
-            mel->coord[i][j] -= trans_(j);
+            mel->coord[i][j] -= trans_[j];
             mel->coord[i][j] /= scalar_;
 
             mel->coord[i][j] *= scalar;
-            mel->coord[i][j] += trans(j);
+            mel->coord[i][j] += trans[j];
           }
         }
       }
     }
 
     for (int i=0; i<dimworld; i++)
-      trans_(i) = trans(i);
+      trans_[i] = trans[i];
 
     scalar_ = scalar;
   }