public static double roundToPrecision(double x, int precision) {
        double roundingOffset = MathLib.ipow(10, precision);
        return round(x * roundingOffset) / roundingOffset;
    }
Rounds to keep <em>precision</em> decimals. Rounds towards even numbers.
@param x the number to round
@param precision the precision to round to. A precision of 3 will for instance round 1.65432 to 1.654
@return the rounded number
main/src/main/java/cgeo/geocaching/wherigo/kahlua/stdlib/MathLib.java