BUENOS AIRES (Reuters) - Raul Alfonsin, who guided Argentina's return to democracy in the 1980s after seven years of brutal military rule but failed to stave off a deep economic crisis, died on Tuesday of lung cancer. He was 82. Alfonsin died at his home in Buenos Aires, said Dr. Alberto Sadler, who had been treating the former president. Alfonsin was president from 1983 to 1989 and won international admiration for putting on trial and jailing the former military leaders who tortured and killed thousands of suspected leftists in a vicious "dirty war." He had been a prominent opponent of the junta that took power in 1976 and his presidency restored respectability to a country regarded as a pariah after decades of coups and often thuggish rule. "Whether you like it or not, you are a symbol of the return of democracy," President Cristina Fernandez said last year when she unveiled a bust of Alfonsin in the government palace. The government declared three days of nat...