add support for ``--derep_prefix`` when we support vsearch 2.1.1 about q2-vsearch HOT 10 CLOSED

Yep. 2018.6 (June) gives me plenty of time to get this right.

I do most of my analysis in R, so I'll be leaning the APIs for q2_types and unit testing as I go.

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I can do this for 2017.11.

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Excellent. We seem green on 2.5.0 with Deblur, and it is in bioconda, should we push forward with that?

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q2-vsearch now relies on vsearch >=2.5.0 so this issue is no longer blocked (fixed in #27).

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The 2.0.3 version pin appears to be coming from the upstream deblur package; we don't appear to be pinning anywhere in the QIIME 2 org on Github.

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I'm working on biocore/deblur#158 but I cannot find a conda installable vsearch==2.1.1. @gregcaporaso, were you installing from an existing repository or by source? I looked at biocore, bioconda and qiime2. However, it seems that Deblur works with vsearch==2.5.0 so it may just be quite insensitive to the version. Verifying right now.

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Hmm, I may have installed from source. I don't think there should be any issue with using 2.5.0 though (if that one is on conda) - as far as I know, the other plugins that use vsearch don't have a version pinned. It'd be ideal to just bump to the most recent version.

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👍 for obtaining vsearch 2.5.0 from bioconda. Can you remove the version pin entirely from the Deblur recipe, or set a minimum version, so that we can keep up-to-date with vsearch releases moving forward?

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I can add support for --derep_prefix
Thanks for building the list of good first issues!

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Thanks @colinbrislawn - the PR freeze started last week for 2018.4, so I don't think this will be able to make it into this release, but we can certainly add it into 2018.6 - does that work for you?

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