CAIRO FACES A CRISIS
Arab world faces potential crisis as opposition intensifies to Sadat's trip; Saudi King Khalid message to Sadat stresses âprinciples of Arab solidarityâ; Tunisia, Morocco and Sudan favor trip; Jordan is silent but country's press attacks visit; Syrian Govt statement declares natl day of mourning for Nov 19; Libyan Gen People's Cong calls for Egypt's expulsion from Arab League and removal of league hq from Cairo if Sadat goes to Israel; says Libya will withdraw recognition of Egyptian Govt; PLO condemns trip; urges Arabs in Israel to declare gen strike and to boycott visit; Arafat scores visit; PLO spokesman Farouk Kaddoumi says Sadat is no longer qualified to speak out on behalf of Palestinians or Arabs; Fahmy's chief adviser Dr Osama el-Baz quits; Kuwait bans criticism of Arab heads of state; rocket attack on Egyptian Embassy in Beirut kills security guard and wounds 2; bombs explode at Air Egypt office in Beirut and near Egyptian Embassy in Damascus; in Baghdad, students declare strike and hold sit-in at student union hq; Syrian-backed As Saiqa group says its forces will support popular uprising' in Egypt against Sadat; illus (M)