DALLAS (Reuters) - The rule book for a new reality TV show is simple -- win over one of the NBA's most notoriously hotheaded owners and walk away with $1 million. Dallas Mavericks owner Mark Cuban, the billionaire bad boy of the National Basketball Association, will join the likes of new reality TV star and real estate tycoon Donald Trump when Cuban steps onto center court for a show on ABC called "The Benefactor." Cuban has calmed down in recent seasons as he sits near the team's bench, but he has paid the NBA just over $1 million in fines...