What's so funny about peace, love, understanding and making a really good rock movie that's not just another easy biography? The former three are matters for higher authorities than me to consider. But the latter has been as elusive as David Bowie's onstage personas. Sure, you have good bios of great musicians -- Rocketman and Sir Elton, Walk the Line and the Man in Black, I'm Not There and Dylan's many disguises, Ray, to name four alone from the aughts (and don't get me star