THERE are many ways to end a rivalry once and for all. In the case of Akbar Tandjung and Wiranto, it ended on a happy note. Both men agreed to bury the hatchet after a bitter contest for presidential candidacy at the Golkar Party convention late last month. Akbar, who lost the contest, graciously invited Wiranto to a private dinner at his residence on Widya Candra in South Jakarta on Sunday two weeks ago to mark the close of their rivalry. Ak