SHANGHAI, November 21 (Reuters): The head of the Tibetan government in exile has visited the U.S. White House for the first time in six decades, a move that could further infuriate Beijing, which has accused the United States of trying to destabilise the region. Lobsan Sangay, President of the Central Tibetan Administration (CTA), was invited to the White House to meet the newly appointed U.S. Special Coordinator for Tibetan Issues, Robert Destro, on Friday, the CTA said in a p