FOR the last two weeks, Idrus has been obliged to stand guard in his village. Just like the other villagers of Sayo, Poso City District, this is an obligation that the thin, bearded, 50-year-old is unable to avoid. The last few nights have been even tenser than usual. The peace that almost arrived after the Malino Declaration was signed in December of last year has evaporated. The Muslims and Christians of Poso are once again at each other's th