Import --i-reference-taxonomy taxonomy.tsv to .qza

Hi @Bing_Guo!

You'll need to import the Greengenes reference sequences and taxonomy map into two artifacts (.qza files) before using them in QIIME 2. The feature-classifier tutorial shows how to import these files using the 85% Greengenes files. The process should be the same for the 97% files as well.

Specifically, you'll need to supply --source-format HeaderlessTSVTaxonomyFormat when importing the Greengenes taxonomy file.

@Nicholas_Bokulich do you have any comments on this?

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