AT THE MOVIES; The camera that followed Eartha Kitt.
NYTimes - almost 34 years
''ALL BY MYSELF,'' a feature-length musical portrait of Eartha Kitt (at the Film Forum through next Tuesday), is the work of the film maker Christian Blackwood. ''Two years ago, I called Eartha,'' he says, ''and I said, 'I'd just like to follow you around and see what happens.' '' Miss Kitt agreed, and the adventure began. When she traveled - once,