obiaddtaxids: add a parser for the UNITE 'general FASTA release' format
There are 2 formats used by UNITE for the fasta headers. obiaddtaxids parses the one used for the 'Full UNITE+INSD dataset'. Another parser could be added for the format used by the 'general FASTA release'.
Example for the header format used by the 'general FASTA release':
>Glomeraceae|AM076560|SH146432.05FU|refs|k__Fungi;p__Glomeromycota;c__Glomeromycetes;o__Glomerales;f__Glomeraceae;g__;s__uncultured_Glomus