The Monkees’ first album in nearly 20 years is also their best since the Sixties – to be precise, since the Head soundtrack in 1968. (Sorry, Instant Replay diehards.) It’s a labor of love – not just for the three surviving lads, but for all the Monkeemaniacs pitching in, headed by producer Adam Schlesinger (from Ivy and Fountains of Wayne), who contributes the gem…