“Unravel” is a curious album title for a band that’s as together as Henhouse Prowlers. “It’s true,” banjo player-vocalist Ben Wright said while calling from his Chicago home. “We’re really close. We had a hard time with naming this album. But that’s what we came up with. We’ve been together for 20 years and we back each other.” That’s not how it was in Wright’s prior band. After a gig in 2003 at Iowa City’s late, lamented Yacht Club, everything …