Added reference results.

Tests/Data/Mechanics/Burgers/cube_1e0_mfront.prj

@@ -62,7 +62,7 @@
         </processes>
         <output>
             <type>VTK</type>
-            <prefix>cube_1e0</prefix>
+            <prefix>cube_1e0_mfront</prefix>
             <timesteps>
                 <pair>
                     <repeat>1</repeat>
@@ -236,13 +236,13 @@
     </linear_solvers>
     <test_definition>
         <vtkdiff>
-            <file>cube_1e0_pcs_0_ts_1_t_0.000100.vtu</file>
+            <file>cube_1e0_mfront_pcs_0_ts_1_t_0.000100.vtu</file>
             <field>displacement</field>
             <absolute_tolerance>1e-16</absolute_tolerance>
             <relative_tolerance>1e-16</relative_tolerance>
         </vtkdiff>
         <vtkdiff>
-            <file>cube_1e0_pcs_0_ts_101_t_1.000000.vtu</file>
+            <file>cube_1e0_mfront_pcs_0_ts_101_t_1.000000.vtu</file>
             <field>displacement</field>
             <absolute_tolerance>1e-16</absolute_tolerance>
             <relative_tolerance>1e-16</relative_tolerance>