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Changelog
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Greengenes T2T - 12_8
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New Features
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* Workflow tools refactored to work towards standarized releases
* Chimera checking now uses Bellerophon and Chimera Slayer targeting gross
    chimeras
* Various deliverables now available, please see 00README
* Taxon names, in particular candidate phyla, are sync'd with Silva

Changes
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* prokMSA_id has been depreceated in preparation for supporing 18S sequences.
    The analogous field is known as GG_ID. If a sequence previously had a
    prokMSA_id, it was retained as its corresponding GG_ID
* Additional fields are now tracked in the Greengenes records, including 
    chimeric information.
* Taxonomy decoration is based off of the 99% OTU tree
* The Greengenes source code is now under the GPL and available from
    https://github.com/greengenes/Greengenes. NOTE: this code does not yet
    provide the full workflow and is an active development project
* Greengenes is now controlled by the Greengenes Consortium represented by
    individuals at the BioFrontiers Institute at CU-Boulder in the USA, the 
    Australian Centre for Ecogenomics at the University of Brisbane in 
    Australia and Second Genome in the USA.

Bug Fixes
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* The percent invariant filter is now being used. The previous release did not
    drop sequences that varied against known invariant positions resulting in
    incorrect grouping within the topology.