Add PICRUSt2 (#13098)
Add PICRUSt2 (#13098)

* Add PICRUSt2

* Clean host dependencies

* Fix version string

* Fix python restriction

* Add noarch

* Update meta.yaml

* Add pandas as a requirement

* Skip py2

* Skip py2 (again)

* Remove python<3.7 restriction

* Add DOI

* Update test section

* Fix tests directory name

* Revert test section

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