VIENNA - From papal prayers to telegrams from China, the world reacted with an outpouring of compassion Wednesday for the victims of Hurricane Katrina in messages tinged with shock that a disaster of this scale could occur in the United States. Islamic extremists rejoiced, giving the storm a military rank and declaring in Internet chatter that ''Private'' Katrina had joined the global jihad. Venezuela's government, which has had tense relations with Washington, announced that it will donate $1 million to help the victims. The money will be channeled through CITGO, a U.S. unit of PDVSA, the government oil company, the...