generate statistics summary table for all tests

[nbokulich]

Current Behavior
It is great that many visualizations show associated statistical tests, and that for some visualizations these results can be downloaded as csv.

However, often many different tests are being performed (e.g., a separate test for each metadata category) and it would be laborious to flip through all visualizations, download results, and concatenate. It is even more laborious to to this for visualizations that do not have an option to download as a csv (e.g., alpha correlation). Just globbing these files was easy in qiime1, but not with qzv files.

Questions
What if all statistical tests associated with a single qzv were automatically compiled into a single summary table, and that table could be downloaded from a "download summary csv" button at the top of the page?

[cherman2]

I am moving this to q2-vizard so that we can take this into account as we develop vizard

[lizgehret]

This is a cool idea, @ebolyen what do you think about this as a q2-stats feature?