CARACAS (Reuters) -Venezuela's government will allow six aides of opposition leader Maria Corina Machado who are currently at the Argentine embassy in Caracas to travel safely to Argentina, a government source said on Friday. The aides, including campaign manager Magalli Meda, previously tipped as a potential replacement for Machado in this year's presidential election, sought protection at the embassy in March after the attorney general's office announced warrants for their arrest.