Ajout des toString

src/Octopus/Entity/Db/ImmobilierBatiment.php

src/Octopus/Entity/Db/ImmobilierLocal.php

src/Octopus/Entity/Db/ImmobilierNiveau.php

src/Octopus/Entity/Db/ImmobilierSite.php

src/Octopus/Entity/Db/Individu.php

src/Octopus/Entity/Db/Pays.php

src/Octopus/Entity/Db/Structure.php

src/Octopus/Entity/Db/StructureType.php