added shift to make contacts association deterministic

apps/benchmarks/GranularGas/GranularGas.cfg

@@ -6,6 +6,7 @@ GranularGas
    isPeriodic < 0, 0, 0 >;
    initialRefinementLevel 1;
    sorting linear;
+   shift < 0.01, 0.01, 0.01 >;
 
    LBAlgorithm Morton;
    baseWeight 1;