By the weekend the Israeli quarters had become a shrine of sorts, and West German President Gustav Heinemann was among those who placed a wreath at the door. A block away dwelt the Lebanese, one Arab group that stayed on after the tragedy, a decision that Assistant Delegation Chief Emile Nassar discussed one afternoon. "We contacted the Prime Minister," said Nassar. "He advised us to do whatever the spirit of sport told us to do." Never has that spirit been more difficult to define than it was last week in Munich.