Added different sb grids for the 2d examples.

examples/dgf/sb2d.dgf

@@ -3,7 +3,7 @@ DGF
 Interval
 0  0                                    % first corner
 1  1                                    % second corner
-4  4                                    % 4 cells in each direction
+8  8                                    % 4 cells in each direction
 #
 
 BoundaryDomain

examples/dgf/sb2d_6400.dgf

+DGF
+
+Interval
+0  0                                    % first corner
+1  1                                    % second corner
+80 80                                    % 4 cells in each direction
+#
+
+BoundaryDomain
+default 1                               % all boundaries have id 1
+#
+
+GridParameter
+name 2d-unit-cube                       % name of the grid
+refinementedge arbitrary                % refinement edge for bisectioning
+overlap 1                               % number of overlap cells
+periodic                                % periodicity parameter for YaspGrid
+closure none                            % no green closure on UGGrid
+copies all                              % let UGGrid make copies
+#
+
+# unitcube2.dgf

examples/dgf/sb2d_65536.dgf

+DGF
+
+Interval
+0   0                                    % first corner
+1   1                                    % second corner
+256 256                                    % 4 cells in each direction
+#
+
+BoundaryDomain
+default 1                               % all boundaries have id 1
+#
+
+GridParameter
+name 2d-unit-cube                       % name of the grid
+refinementedge arbitrary                % refinement edge for bisectioning
+overlap 1                               % number of overlap cells
+periodic                                % periodicity parameter for YaspGrid
+closure none                            % no green closure on UGGrid
+copies all                              % let UGGrid make copies
+#
+
+# unitcube2.dgf