Over the last week, the jazz world has been reeling from the announcement that the International Association of Jazz Educators, a de facto trade organization, is going out of business.In an e-mail message sent on April 18, the 10,000-member organization, based in Manhattan, Kan., announced that its executive board had decided to file for bankruptcy and that its annual convention, which was to be held in Seattle next year, had been canceled.The group's demise is a major disappoint …