Silverdocs is now the biggest documentary film festival in the United States. It opens tomorrow in Silver Spring, Maryland, with an outstanding line-up of documentaries — old, new, long, short, funny, sad, domestic and international. Some of the highlights include a tribute to Albert Maysles (of “Salesman,” “Grey Gardens,” and “Gimme Shelter”), opening night film “More than a Game” about an Akron, Ohio basketball team featuring future superstar LeBron James, and films about a facial hair competition, the Washington D.C. “mayor for life” Marion Berry, a prison rodeo, being struck by lightning, an environmental struggle between indigenous people and multi-national oil companies in Ecuador, Vogue’s monumental September issue, and the acknowledged worst movie ever made (followed by a screening of the film itself, “Troll 2”).