Sorted the input of taxonomic columns

Specifying taxonomic columns (e.g., Taxonomic lineage (SPECIES), Taxonomic lineage IDs (SUPERKINGDOM)) was always outputting the columns Taxonomic lineage and Taxonomic lineage (Ids).

These columns are no longer outputted if not called for.

Also, several fixes

Fixed outputting taxonomy with extra space (e.g. Bacteria -> Bacteria).
Fixed case where no additional IDs are mapped, it was throwing error.
Fixed case where no columns are inputted.
Fixed getting fasta - request was badly formatted.