Open links to all individuals in the swarm

def open_links(self):
        """
        Open links to all individuals in the swarm
        """
        if self._is_open:
            raise Exception('Already opened')

        try:
            self.parallel_safe(lambda scf: scf.open_link())
            self._is_open = True
        except Exception as e:
            self.close_links()
            raise e