POP singer Herman is doing his own version of the Hawaiian war dance. With suitcases.     Very appropriate. For 18-year-old Herman is pictured before flying to Hawaii with his group yesterday to begin a million-dollar six-week tour of America.     The other members of the group - The Hermits - nearly missed the plane.     They arrived at London Airport

only a few minutes before take-off. But there was no chance of them missing Herman.     He was wearing a white denim suit, mauve shirt and a blue Breton cap.     What's he going to do with his share of all the money?     "Invest it," he said.