Handle local deletion / renaming attempts of a non editable folder

If a folder can not be renamed / deleted, typically a virtual folder, attempt to rename / delete it from the server should not be made by the client. Currently it raises an exception server side which is logged client side and the folder item is blacklisted for 5 minutes.
Instead, as for deletion, the client should mark it as created remotely for the next synchronization to recreate it.

Rename / move tests will have to be reviewed when doing this task.

As for the local root folder, its renaming / deletion should also be handled (currently crashes the client), by unbinding the related server (another approach would be to reset last synchronization date and active roots in order to force the folder re-creation).