Another day and another Ray and Rondo rumor. This one is from Yahoo: The Boston Celtics appear willing to make major roster changes to balance a chance for a championship run and future financial flexibility.The Celtics offered Ray Allen(notes) and Rajon Rondo(notes) to the Detroit Pistons for a package that included Richard Hamilton, Tayshaun Prince and Rodney Stuckey, league sources told Yahoo! Sports.Boston general manager Danny Ainge and Detroit’s Joe Dumars never spoke, but rather the C...