Democratic Management of Schools: From Self-Government to the Rise of a Managerial Post-Democracy? [La Gestion Démocratique Des Écoles: De L'autogouvernement À L'émergence D'une Post-Démocratie Gestionnaire?] [A Gestão Democrática das Escolas: Do Autogoverno À Ascensão de Uma Pós-Democracia Gestionária?]