United Nations chief Antonio Guterres voiced concern Wednesday over “escalation” in Sudan’s conflict to the country’s army chief when they met on the sidelines of a diplomatic gathering in New York. Sudan has been high on the agenda at the UN’s centerpiece meeting this week, with the dire humanitarian situation and refugee crisis dominating discussions on the war that broke out in April last year. The conflict between two rival generals – the head of the army, and the head of the paramilitary Rapid Support Forces – has so far displaced more than 10 million people, a fifth of Sudan’s population…