DISCUSSION OF FOREIGN POLICY MATTERS; PANAMA; SHOOTDOWN OF T-39 AIRPLANE IN EAST GERMANY; LBJ LISTS NUMBER OF TIMES HE HAS MET WITH RUSK, MCNAMARA, MCCONE, JCS; DISCUSSION OF SENATE CIVIL RIGHTS BILL FILIBUSTER; LBJ INVITES TROHAN, SCRIPPS, MCNEIL, THE MCNEILS TO LUNCH