By Kate Abnett, Gloria Dickie and William James SHARM EL-SHEIKH, Egypt (Reuters) – Government ministers and negotiators from nearly 200 countries on Tuesday began the hard slog of finding common ground for a deal at the annual U.N. climate summit, as host country Egypt assured that the slow-moving talks were still on track. Some delegates began, however, to discuss the possibility that the summit would go overtime into the weekend, with countries still snagged on key issues including crucial funding for developing countries to combat and adapt to climate change. Egypt’s Environment Minister Ya…