For anyone looking to teach a master class in brainwashing techniques, “The Source Family” might be an excellent place to start. Documenting the hippy-dippy lifestyle and hedonistic principles of Hollywood’s favorite 1970s cult — led by the self-professed guru and suspected bank robber Jim Baker, a k a Father Yod — Maria Demopoulos and Jodi Wille’s disturbing film is an object lesson in psychological manipulation.