OFUNATO, Japan (Reuters) - With a minute of silence, tolling bells and prayers, Japan will on Sunday mark the first anniversary of an earthquake and tsunami that killed thousands and set off a nuclear crisis that shattered public trust in atomic power and the nation's leaders. A year after the magnitude 9.0 earthquake unleashed a wall of water that hit Japan's northeastern coast, killing nearly 16,000 and leaving nearly 3,300 unaccounted for, the country is still grappling with the human, economic and political costs. ...