HAVANA (Reuters) - Cuban President Fidel Castro is walking, talking and being briefed, according to a cryptic statement published Saturday in the Communist Party daily, Granma, a day before the "Maximum Leader's" 80th birthday. "Someone who visited the comandante a few hours ago to brief him on certain matters ... said he witnessed how the head of the revolution, after receiving a little physical therapy, walked in the room and later, sitting in a chair, engaged in an animated conversation," Granma said. Castro has not been seen publicly since he temporarily ceded power to his younger brother on July 31...