Viator to Operate Independently   TripAdvisor announced 200 layoffs around the world as part of the company’s reorganization, emphasizing on Viator as a separate tours and activities brand. The statement letter reports that Dermot Halpin, TripAdvisor’s president of experiences and vacation rentals, is leaving the company, and that CEO and Co-Founder Stephen Kaufer will run the Experiences team for 90…