Function retarget_note 

fn retarget_note(
    qt: &CxxQtThread<Sioul>,
    shared: &Arc<Shared>,
    loaded: &Loaded,
    path: &str,
    new_path: &str,
)

What names a note by its address follows it to its new path: the tasks’ links (changed, then sent), and the ties Sioul keeps itself.