BAGHDAD, Iraq - Roba al-Asaly fingers the sliver of gold on her necklace and explains that it reminds her of a place "that's not there anymore." ADVERTISEMENT The gold is shaped like the map of Iraq, and at a time when sectarian violence has fanned fears of civil war, it has become a gesture of defiance and of yearning for national unity. It is seen on the streets and on television. Anchorwomen wear it while reading the news on Al-Iraqiya and Al-Sharqiya, Iraqi TV stations that are secular and more tolerant of women's jewelry. "I hold on to it with...