It was hailed as the greatest rock'n'roll reunion of the decade. But as the Gallaghers might say, it was much bigger than that. Cardiff town centre was ground to standstill aside from packed bars hours before the show, and thousands came without tickets, such is the power and love for the band. Before they had spoken or played a note, Liam and Noel linked hands and held them aloft to show their war was over and Oasis really were back. Then they let their music do the talking initially with