By Martin Quin Pollard SHANGHAI (Reuters) – China’s change of leadership in Xinjiang could indicate greater emphasis on economic development in the region, experts said, although its security crackdown targeting minority Muslims is unlikely to see a significant change in direction. On Saturday, the official Xinhua news agency reported that Chen Quanguo, whose heavy handed security campaign in the western region drew international sanctions, had been replaced after five years. Chen, 66 and a member of China’s Politburo, a top policy-making body, was succeeded as Xinjiang Communist Party secreta…