By Steve Pond Playing Fanny Brawne in writer-director Jane Campion’s film “Bright Star,” Abbie Cornish has what might be considered an unenviable task: persuading audiences that her character, a headstrong, stylish young woman in 18th Century England, is passionately in love with poet John Keats (Ben Whishaw) even though neither of them can show it, and that their love is one for the ages even though it remains chaste. That she pulled if off it evidenced by reviews that are for ...