In Casablanca Neighborhood, Ruptured Calm
Speculation grows that suicide bombing attacks in Casablanca at five separate sites that killed 41 people, including 13 bombers, might have blended order from abroad with homegrown organization; Moroccan authorities are calling attacks highly coordinated terrorist operation linked to sophisticated international terrorist network; but fact that suicide bombers' likely target, sprawling Jewish cemetery, escaped harm, and that three young Muslim men are among victims, lends amateur quality to events; King Mohammed VI arrives in Casablanca to show his direct involvement in aftermath of attacks; stops at several bombed sites, including hotel, Jewish cultural center and private Spanish club; says he has asked Interior Ministry and security services to investigate 'in full transparency' and to keep public informed of developments; photos (M)