Dataset-creator

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* Fixed creating dataset with 1st, 2nd or 3rd codon positions.

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* upgrade `seqrecord-expanded`.

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* Fixed bug that did not replace all white spaces for underscores in taxon names
when building datasets. Due to taxon names with whitespaces, the NEXUS
interpreter assumed that part of the name was actually part of the sequence,
rendering the sequence invalid.
* Added some dependencies to requirements.

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* Upgraded seqrecord-expanded requirement.

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* Fixed bug that produced FASTA sequences with underscores. Now all voucher codes
will have their dashes replaced by underscores.

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* Create datasets using the GenBankFASTA format. This format has the following
extra info in the description of sequences:
>Aus_aus_CP100-10 [org=Aus aus] [Specimen-voucher=CP100-10] [note=ArgKin gene, partial cds.] [Lineage=]