The average income in New Orleans scooted a bit higher this month when Brad Pitt and Angelina Jolie dropped $3.5 million on a French Quarter mansion. The Hollywood couple, who occupy the upper strata of celebrity, bought a three-story, 7,400-square-foot home in the lower French Quarter this month and have enrolled their oldest child at a local school. The house they selected -- their fourth, according to a tabloid that posted the story on its Web site this week -- is a gray-green, balconied affair near the riverfront, complete with a two-car garage, a detached guest house and a rear...