Since news broke that a film crew from Universal Studios would be making a movie on the Vineyard during the next two months, a subtle primping has been in the March wind. A few fishermen who are rarely seen in working togs have been hanging around Edgartown’s Main street with a cultivated crustiness. Waning Shakespeareans crib for an impromptu audition and casually mutter Falstaff speeches in grocery lines. Archtypal New Englanders develop brooding into a form of showmanship.