CHRISTCHURCH=Manacled and barefoot, Brenton Harrison Tarrant walked into a courtroom on Saturday and flashed an “OK,” widely seen as a symbol of white power, as he stood to face murder charges less than 24 hours after brutal assaults on two mosques in this city left at least 49 dead. Police named Tarrant the primary suspect in what was the deadliest attack in New Zealand’s history — and one of the worst cases of right-wing terrorism in years — after the 28 year-old Australian allegedly stormed two mosques during mid-day prayers on Friday and mowed down dozens of huddling and fleeing...