Link access was either public or private and was only allowing readers.
This commit makes link access more powerful:
- link reach can be private (users need to obtain specific access by
document's administrators), restricted (any authenticated user) or
public (anybody including anonymous users)
- link role can be reader or editor.
It is thus now possible to give editor access to an anonymous user or
any authenticated user.
Versions are retrieved directly from object storage and served on API
endpoints. We make sure a user who is given access to a document will
only see versions that were created after s.he gained access.
This project was copied and hacked to make a POC in a 2-day hackathon.
We need to clean and refactor things in order to get a first version
of the product we want.
