* added first_line_only option in fill method   * if true, returns GenBank style output (only first line starts with prefix).   * if false, returns EMBL style output (every line starts with prefix).
* added first_line_only option in fill method
  * if true, returns GenBank style output (only first line starts with prefix).
  * if false, returns EMBL style output (every line starts with prefix).

csw/bioruby-phyloxml