qiime2 export tool uses wrong format #89

Problem: There is no nwk format in Galaxy. The correct name is newick.

Therefore the discover datasets used here is wrong:

Solution could be

<discover_datasets assign_primary_output="true" pattern="(?P&lt;designation&gt;tree)\.nwk" format="newick" visible="true"/>

The change would be needed in a few more places.

Workaround for users: manually assign datatype newick (in workflows this can be automatized)