Creating a great work of art is very much like creating a heartfelt, loving relationship. Both take work and commitment, both in good times and bad. The challenges can be difficult, but the rewards can be incalculable. Learning how to successfully maneuver through them, as well as how to strike a harmonious balance that keeps both ventures moving forward, is a skill that takes an array of abilities and aptitudes to master, but, as documentary filmmaker Matthew Heineman’s latest so deftly illustrates, it’s an attainable goal, the prevailing highs and lows notwithstanding. The film follows the e...