The Jayhawks lead this week's picks...by Michael Gallucci...CD The Jayhawks (Lost Highway) The alt-country pioneers' 1986 debut (which fans refer to as "The Bunkhouse Album") doesn't sound much like their classic Hollywood Town Hall. But the ancestors they quote — particularly the Flying Burrito Brothers — and the foundations they lay here became the cornerstones of their quarter-century career. It's finally on CD, so you can throw away your turntable. DVD Avatar (Twentieth Century Fox) One of last year's best movies plays surprisingly well at home, even…...