ALBANY, N.Y. -- Late at night the lights burned in the governor's study. Mario Cuomo was reading, he was writing, he was worrying, he was agonizing, he was brooding.For as all the world knows, Cuomo, who died Thursday just after his son, Andrew, was sworn in for his second term as governor, knew misery and torment. He may have been a tough three-term governor, and yet he worried if his children, adults now, were learning enough in their work.