The New York Times and The Washington Post are weighing a new and wrenching demand from the Unabomber: publish his 35,000-word anarchist manifesto, and he'll end a 17-year campaign of murder through the mail. Both newspapers received the mailed document Thursday. The newspapers would have to print three follow-up messages a year, and the Unabomberhas not promised to halt a campaign of blowing up buildings or other property.The offer has thrown the journalistic world onto the horns of a dilemma: "The bomber might be satisfied or he might not be," says Everette Dennis, executive director of the Freedom Forum Media Studies Center in New York. "The ante might go up. How about 24 hours on CNN? A half hour on the nightly news?"