private int randomseed(LuaCallFrame callFrame, int nArguments) {
        BaseLib.luaAssert(nArguments >= 1, "Not enough arguments");
        Object o = callFrame.get(0);
        if (o != null) {
            callFrame.thread.state.random.setSeed(o.hashCode());
        }
        return 0;
    }
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