At The Hague, the top Bosnian-Serb war crimes suspect in U.N. custody, a general accused of overseeing the 1995 massacre of thousands of Muslims, today denied genocide charges. At his arraignment before the Yugoslav War Crimes Tribunal, General Radislav Krsti? also pleaded innocent to crimes against humanity and grave breaches of the Geneva Conventions. Krsti? was arrested last week by U.S. members of the NATO peacekeeping force in Bosnia. No trial date has been set.