Push recent work to Cavia release?

I believe there are no needed changes to OT taxonomy or other dependencies, so I'd like to push all our recent improvements to production (Cavia). **However, I do see a few loose ends**:

- Duplicate-study tests are still returning lots of "false positives." This should probably be fixed to avoid confusion.

- I'd love to get some concentrated user testing (from @mtholder or @josephwb?) of the tools for defining hte meaning of ambiguous internal labels in imported Newick trees.

- We currently offer two MRCA tests for a tree in the curation app -- one against the OT taxonomy, and another using the latest synthetic tree. Maybe it's useful to have both? Or should one of these be removed? Again, maybe some testing will give us the answer.