HardSoftBigDecimalScore and SimpleBigDecimalScore must properly implement power(double)

        // TODO FIXME remove .intValue() so non-integer exponents produce correct results
        // None of the normal Java libraries support BigDecima.pow(BigDecimal)
        return new HardSoftBigDecimalScore(
                hardScore.pow(exponentBigDecimal.intValue()).setScale(hardScore.scale()),
                softScore.pow(exponentBigDecimal.intValue()).setScale(softScore.scale()));