Did Johnny Hart -- the beloved creator of "B.C." and one of the most widely read cartoonists on Earth -- sneak a vulgar defamation of Islam into the comics pages last week? The question was raised yesterday by the Council on American-Islamic Relations (CAIR), a Washington-based civil rights group, in an e-mail to its membership. Hart and his syndicate say no -- that a simple, straightforward joke is being misconstrued. That may well be true, but the 73-year-old cartoonist's history of evangelizing his Christian beliefs through his comic cavemen have left many people doubtful. The cartoon, which appeared Nov. 10...