pan_correlation using old TZ adjustment which sets _time to null

[ohoppe-dev]

  timeExpression: "__tz ? (time.getTime() / 1000) + (__tz * 3600) :
    (time.getTime() / 1000)"

to

  timeExpression: "__tz ? C.Time.adjustTZ(time.getTime(), 'UTC', __tz) / 1000 :
    time.getTime() / 1000"