fix DistData struct to make it compatible with Elemental release 0.87
fix DistData struct to make it compatible with Elemental release 0.87

rocanale/R-Elemental,HPAC/RElem,rocanale/RElem,rocanale/RElem,HPAC/RElem,rocanale/RElem,rocanale/R-Elemental,HPAC/RElem,rocanale/R-Elemental