The late Lillian Hellman, creator of “The Children’s Hour,” “Toys in the Attic” and “Watch on the Rhine,” is considered one of the foremost playwrights of the 20th century.Her first play, “The Little Foxes,” has always been an excellent showcase for actresses playing the role of Regina Giddens, the evil-minded, scheming sister. When the play premiered on Broadway in 1939, Tallulah Bankhead took the part followed by Bette Davis in a very successful film adaptation. In …