(From left) Ralph Abbruzzi, George Borgesi, the late Frank Gambino, Joey Merlino and "Uncle Joe" Ligambi By George Anastasia For Bigtrial.net Is jailed mob boss Joseph "Uncle Joe" Ligambi or any other member of his organization a secret "patron of the arts?" That question surfaced this week as the FBI in Boston said it was close to solving a $500 million art heist that may have had a Philadelphia underworld connection. In a week full of wild speculation, rumor and innuendo about the 1990…