It was up there with the most curious friendships in modern Irish history. Charles Haughey, the disgraced former taoiseach, up close and personal with Vincent Browne, the journalist who famously investigated the Arms Crisis that almost finished his career, and pursued him over his unexplained wealth. There were around 20 conversations between them, late in Haughey’s life, when the extent of his corruption had already been laid bare in two tribunals. Two decades on, Browne remembers the sun streaming through the window while they talked at Haughey’s Kinsealy mansion one day. “We were in the bar, we always went to…