(Reuters) -Humanitarian aid to Tonga is ramping up after the airport was cleared of ash, making it safe for planes to land, the Red Cross said on Wednesday, days after a volcanic eruption and tsunami devastated the South Pacific archipelago. The International Federation of Red Cross and Red Crescent Societies (IFRC) said that with the extra supplies, its staff and volunteers are stepping up deliveries of drinking water and setting up shelters across the country’s many islands. “This disaster has shaken the people of Tonga like nothing we have seen in our lifetime,” Sione Taumoefolau, secretary…