CHARLES SAERANG, 48, secretary general of the Indonesian Association of Traditional Herbal Medicine Producers, has found it hard to smile lately. He seems to be at his wits' end and can't understand why in the last two years the Malaysian government has increasingly tightened the flow of imported Indonesian traditional herbal medicines, locally known as jamu. Semarang-born Charles fears that if this policy stays, exports of the herbal concoctions t