KES (1969, UK, 111m, PG) ****½ Drama, Family dist. United Artists; pr co. Kestrel Films / Woodfall Film Productions d. Ken Loach; w. Barry Hines, Ken Loach, Tony Garnett (based on the novel “A Kestrel for a Knave” by Barry Hines); pr. Tony Garnett; ph. Chris Menges (DeLuxe | 1.66:1); m. John Cameron; ed. Roy…