AWAY from the bustle of Jalan Sudirman and Jalan Thamrin in Jakarta, Czechoslovak historian Rudolf Mrázek drove toward the West Irian Liberation Monument at Lapangan Banteng. On that scorching afternoon in the early 1990s, the capital’s roads were still relatively quiet. At an intersection near Jalan Pejambon, he turned left and arrived in a leafy neighborhood. Mrázek, then in his 50s, was on his way to meet a key source for h