John McLaughlin has been called a lot of things since his searing guitar work on Miles Davis’s seminal 1970 album “Bitches Brew’’ helped kick-start the jazz/rock fusion movement. With his blazing technique and lean, sinewy sound, he’s been dubbed a speed demon, a spiritual seeker, the ultimate shredder, and simply “the best guitarist alive’’ in the words of Jeff Beck, no six-string slouch himself.