KABUL, Afghanistan (AP) -- The new leader of the Afghan Taliban faces the twin challenges of bringing together an insurgency that he ran for years under another man's name and uniting a fractured movement that has seen fighters desert for more extreme groups such as the Islamic State. Meanwhile, the Afghan government believes it can seize on the Taliban leadership crisis it has created by announcing that Mullah Mohammad Omar has been dead for more than two years to further weaken the in...