* fix(users-context): add missing logs
* fix(user-persistent-data): collection publication selector for viewers
Fixes the collection's selector when publishing it to viewers.
* fix(users-context): correctly add user persistent data
Changes the logic of the add_user_persistent_data action in users
context, so that the user information already in the context is merged
with the new one. Also, do not flip the logged out status of users added
by user_persisted_data anymore.
