With a new pair of reissues, Demon Music Group’s Edsel label is the in the right place, for the label has turned its attention to the catalogue of one of the funkiest men alive: Mac Rebennack, a.k.a. Dr. John, the Night Tripper. An A&R man, arranger, producer, artist, and session musician since the early days of New Orleans rock and roll, the good doctor came into his own as a solo headliner with 1968’s Gris-Gris. Since that psychedelic exploration of N’awlins-style R&B, Dr. John has