@Override
    public int compareTo(Bytes that) {
        return BYTES_RAWCOMPARATOR.compare(this.bytes, this.offset, this.length, that.bytes,
                that.offset, that.length);
    }
Define the sort order of the Bytes.

@param that The other bytes writable
@return Positive if left is bigger than right, 0 if they are equal, and negative if left is
smaller than right.
stroom-bytebuffer/src/main/java/stroom/bytebuffer/hbase/Bytes.java