/// <summary>
        /// Writes a single data element to the formatter.
        /// </summary>
        /// <param name="formatter">Formatter</param>
        /// <param name="data">Tree Data</param>
        public static void Format(this IPhylogeneticTreeFormatter formatter, Tree data)
        {
            var fs = ParserFormatterExtensions <IPhylogeneticTreeFormatter> .GetOpenStream(formatter, true);

            if (fs != null)
            {
                formatter.Format(fs, data);
            }
            else
            {
                throw new Exception("You must open a formatter before calling Write.");
            }
        }
        /// <summary>
        /// Writes a single sequence to the formatter.
        /// </summary>
        /// <param name="formatter">Formatter</param>
        /// <param name="data">Tree data</param>
        /// <param name="filename">Filename</param>
        public static void Format(this IPhylogeneticTreeFormatter formatter, Tree data, string filename)
        {
            if (formatter == null)
            {
                throw new ArgumentNullException("formatter");
            }
            if (data == null)
            {
                throw new ArgumentNullException("data");
            }
            if (string.IsNullOrWhiteSpace(filename))
            {
                throw new ArgumentNullException("filename");
            }

            using (var fs = File.Create(filename))
                formatter.Format(fs, data);
        }