(Photo: Royal Opera House/Tristram Kenton) A map unfolds to become mammoth-sized over the stage in Laurent Pelly’s 2007 production of “La Fille du Régiment:” a zany and cartoonish exposition of this far-fetched comic tale that stretches paper-thin our talent for suspending disbelief. Mounting the set in an unspecified era with almost incidental visual references to furniture, furnishings and fashions of the {…}