When I wandered through the newsroom this morning, several people went out of their way to say how much they liked ''No Direction Home,'' the Bob Dylan documentary that continues on PBS tonight. Yes, they are all about my age and so have a sense of Dylan at his most iconic. Still, it was a good thing to hear. I have been writing about the program for months, and very positively. Since I first saw it with colleagues whose reactions were mixed, I worried more than once that I was too happy about the show. But, judging from the reaction this morning, maybe not.