http://www.nytimes.com/2015/07/22/opinion/a-milestone-for-justice-in-africa.html?smprod=nytcore-iphone&smid=nytcore-iphone-share By THE EDITORIAL BOARD JULY 22, 2015 On Monday [20 JUL 15], a landmark trial began that could herald a new era of justice and accountability in Africa. The former president of Chad, Hissène Habré, is being tried over atrocities committed during his rule in a new court set…