IT'S STILL THE SAUDIS By STEPHEN SCHWARTZ A GROUP calling itself "the Secret Group of al Qaeda's Jihad in Europe" has claimed "credit" for Thursday's deadly bombings in London. Some refer to the perpetrators of this latest horror as "an unknown group." But there is nothing mysterious about the background of the London atrocities. First, and foremost, there is nothing secret, unknown or hidden about the prime source of financing for the terrorists: Saudi Arabia. As the leading Saudi human-rights activist, Ali al-Ahmed, of the Washington-based Saudi Institute, puts it, "all the roads lead to Riyadh." The Saudi kingdom...