While comics dealing with cancer have usually been true life tales — Mom’s Cancer or Our Cancer Year — AN ELEGY FOR AMELIA JOHNSON takes a more unusual tack, following the two best friends of a dying woman — a slightly egotistical documentary director and a self-absorbed journalist — as they journey to bring her last words to the people she cares about. But if you think this is going to be a weepy about a saintly sick person…you are wrong.