Reproducibility of experiments with private databases

We have recently introduced the concept of confidentiality with databases. This move brings a new set of possibilities for databases that can be inserted into the platform, but also brings a few restrictions. We must study and find solutions for the following use-cases:

• User wants to publish results for an experiment using a private database.
• User publishes results for an experiment using a database that later becomes private (e.g. its license is not renewed and we must make it private - i.e., no new experiments can be conducted using it. Existing results remain valid).

Once the proper behaviour has been implemented into the platform, we can safely close this bug.