The Afghan president, who hasn't been shy about criticizing the West, is turning on the charm as the mission winds down and long-term aid is in question.KABUL, Afghanistan — Afghan President Hamid Karzai, perhaps best known in the West for periodic well-aimed jabs at his NATO allies, is embarking on a determined charm offensive as he faces the prospect of seeing troops and, perhaps even more crucially, dollars slip away from his country.