[FIX] note: fixed note creation.
When creating a new note, a function field requires to browse the note in order
to get the stages. However the basic rule for creating a note is to be in the
followers. As followers is another field set during the creation, we are not
sure uid is already in the followers of the note when reading it. We therefore
do it as SUPERUSER_ID, because it is only to have access to some technical
data of the note.