TEHRAN, Jan 31 (AFP) - Ezzatollah Sahabi, a 77-year-old senior opposition leader freed from prison last year, dared Iran's powerful conservative clerics Friday to execute him if he was a true threat to the Islamic republic. "If you belief that I'm so harmful for the country, the people, Islam and the revolution, then execute me, because in any case there is another world where we will all be judged," Sahabi wrote in an open letter asking for support from reformist President Mohammad Khatami, Parliament Speaker Mehdi Karrubi and justice chief Mahmoud Hashemi Shahroudi. Sahabi, a senior leader of the outlawed...