Ballots Pour Into Afghan Counting Centers KABUL, Afghanistan - Ballot boxes poured into counting centers Monday for a tally of the troubled presidential election in Afghanistan amid signs an opposition boycott was wavering after at least two candidates agreed to accept the ruling of an independent panel's inquiry.    Election organizers hope their decision, announced late Sunday, to establish a panel of about three foreign election experts to investigate the balloting will end the boycott, which many fear could seriously undermine the winner's ability to rule this war-ravaged nation...