It’s tough to describe John Wilson ’s new documentary, “ The History of Concrete ,” premiering on opening night at Sundance. On one hand, it’s as promised in the title: An examination of the building block of cities and societies that often goes unnoticed, and how its usage and degradation can stand as a metaphor for human nature. There’s a strong meta-element, as Wilson turns the camera on during the process of finding financing for the project, often unable to close the deal when the topic is,