Any time a notable figure of the French New Wave is introduced in Richard Linklater’s “Nouvelle Vague,” we’re treated to a momentary straight-on shot of them, with a nameplate — Claude Chabrol, Jacques Rivette, Éric Rohmer — at the bottom of the screen. It’s a little like Linklater, as he goes, is cataloging different species of the same 1950s genus, or playing a grand game of New Wave “Guess Who?” “Nouvelle Vague” is principally about Jean-Luc Godard (Guillaume Marbeck) and the making of his