EAST HAMPTON, N.Y. — Grey Gardens, the Hamptons home once owned by eccentric relatives of Jacqueline Kennedy Onassis, is for sale. It was featured in a documentary, HBO movie and Broadway musical. Newsday (http://nwsdy.li/2lpulqH ) reports it has been listed for $19.95 million. In a 1975 documentary, it was the rundown home of Onassis’ aunt
