Guy Lodge Film CriticThere’s just so much summer in “The Tsugua Diaries” — great lashings of sunlight warming and slightly melting every 16mm frame, tangles of hyper-green foliage that seem to sweat in the heat, a generally horny, indolent air of human mischief — that you’d be forgiven for assuming “Tsugua” is some idyllic holiday spot you’ve never heard of, the best-kept secret on the Algarve.