public void increment(final Counter counter) {
        if (counter == null) {
            return;
        }
        increment(counter.n, counter.m2, counter.sum, counter.min, counter.max);
    }
Creates the combined statistics by merging the current counter with the specified counter.
@param counter The counter that must be included in this counter
benchmarks/src/main/java/nl/basjes/statistics/Counter.java