Early data may have non-unique obs names

In previous versions of the uploader, data was not made to have unique obs names on upload; the result is that some functionality (namely CXG) will raise a server error page.

To fix: either go through all data uploaded before the uploader was updated and run .obs_names_make_unique() or have the CXG container create a copy of the data, run the method, then use that data for the CXG visualization.