Access signaling

[florentinap]

Access can be managed for each workspace and document. You can know if a workspace/document is private only if you open Manage Users popover. I think that would be useful to see faster the access level.

Each workspace has an icon. We can use it. The color of icon can be different for each access level:

• shared with everyone or anonymous -> icon is green;
• shared with other people than yourself (the owner) but not with everybody -> icon is yellow;
• shared only with you (the owner)-> icon is gray.

The same algorithm can be used for documents. Currently, icon is displayed only for documents shared with everyone, for the other access level no it is shown. But this can easily be fixed.