In the wake of the solar eclipse that has captured people’s imaginations, and clogged up their social media feeds, Steven Rainey takes a bit of artistic licence and delves back into Pink Floyd’s history to rediscover an album that finds them revelling in the darkness caused by the blotting out of the sun.Technically, Obscured by Clouds is a soundtrack album for the French film La Vallee, a reasonably obscure oddity that finds a woman going on a voyage of self-discovery in New Guinea. I haven’t seen it, and I’m betting you haven’t either (and if you have, fair play to you –…