By Martyn Herman RIO DE JANEIRO (Reuters) - Britain's women's team pursuit squad christened the Rio de Janeiro Olympic velodrome with a world record on the first day of the track cycling program on Thursday. Shortly before the British men won gold in the team sprint in an Olympic record, the quartet of Laura Trott, Katie Archibald, Elinor Barker and Joanna Rowsell-Shand, clocked four minutes, 13.260 in the qualifying round of the 4,000m event. More...