BUENOS AIRES (Reuters) - Argentina's biggest media group is resisting pressure from President Cristina Fernandez to dismantle its broadcasting empire to comply with an anti-monopoly law that critics call an assault on free speech. Three years since the combative leader hailed the reform law as the start of a new era of media diversity, she has given Grupo Clarin until December 7 to start selling off dozens of operating licenses or have them auctioned by the state instead. "We're going to have to brace ourselves for some pretty wacky stuff ... ...