BEIJING (Reuters) - As the number of self-immolations in restive Tibetan regions rises sharply, Beijing appears to be tightening rules against the anti-China protests despite hopes the new leadership may take a softer line against Tibet. Some experts have said Communist Party chief Xi Jinping -- whose former vice premier father had a close bond with exiled Tibetan spiritual leader the Dalai Lama -- might adopt a more reformist approach to the troubled mountainous region when he takes over as president in March. ...