Attention must be paid. That's the line — the big line from ''Death of a Salesman.'' And, if you missed it this last week or so, well, you weren't paying attention. It was the headline in the Christian Science Monitor, and the New York Times: ''Attention Must Be Paid.'' California's Contra Costa Times went with: '' 'Attention Must Be Paid' To Playwright.'' And the Chicago Tribune saved it for the slow-motion elephantine punchline of its opening paragraph: ''The Man who wrote 'Death of a Salesman' died Thursday. And attention must be paid.'' In Britain, where they've built an Arthur Miller...