Christopher Knight: Pacific Standard Time should underwrite full retrospective exhibitions of artists with significant histories of working in Los Angeles, beginning in the late 19th century and continuing to the present. Not project shows. Not young or emerging or new artist surveys. Not a phalanx of partial looks at a segment of an established artist’s output. Instead, I mean full, rigorous accountings of historical figures, as well as artists beyond mid-career who have been in it for the long haul — a generation or more.