code: function SDFSplitter(handler) {
          parser.SDFTransform.call(this);
  
          this.on('data', function (chunk) {
              handler(String(chunk));
          });
      }
docs: A Writable stream that splits an SDF file into individual MOL file segments
  suitable for passing to parseMol.
  
  Output is via callback.  See SDFTransform for output via Streams API
  
  @class SDFSplitter
   
  
  @constructor
  @method SDFSplitter
  @param {Function} callback function to call with molfile data
  @return {SDFSplitter} a Writable stream which calls the supplied callback
  once per molfile in the supplied SDFSplitter stream