Perhaps few readers here will have heard of Pierre Braunberger, who was not a blustering producer like Jack Palance in Godard’s “Contempt.” No, he was the nervous mouse type. He had a habit of nibbling on business papers, and it is said he once went into a screening, kept chewing as the movie unspooled, and realized later that he had eaten a check from an investor. Braunberger was someone with contacts and a little money who could sometimes help a picture. He bought the distribution rights to “Un chien Andalou” and “L’age d’or” by Luis Bunuel. He was a stalwart in the early career of Jean Renoir, and he produced “Une partie de campagne” and guarded it in the 10 years it took to complete. Career enough already — except that decades later, there he was, ready to help again on “Tirez sur la pianiste” by Truffaut, on Godard’s “Vivre sa vie” and on “Un homme et une femme” by Claude Lelouch.