tests: Moins de tests sur les filtres de date

ecrire/tests/Filtre/Date/AffdateCourtTest.php

ecrire/tests/Filtre/Date/AffdateHeureTest.php

ecrire/tests/Filtre/Date/AffdateJourcourtTest.php

ecrire/tests/Filtre/Date/AffdateMoisAnneeTest.php

ecrire/tests/Filtre/Date/AnneeTest.php

ecrire/tests/Filtre/Date/DateIcalTest.php

ecrire/tests/Filtre/Date/DateInterfaceTest.php

ecrire/tests/Filtre/Date/HeuresMinutesTest.php

ecrire/tests/Filtre/Date/HeuresTest.php

ecrire/tests/Filtre/Date/JourTest.php

ecrire/tests/Filtre/Date/JournumTest.php

ecrire/tests/Filtre/Date/MinutesTest.php

ecrire/tests/Filtre/Date/MoisTest.php

ecrire/tests/Filtre/Date/NomJourTest.php

ecrire/tests/Filtre/Date/NomMoisTest.php

ecrire/tests/Filtre/Date/NormaliserDateTest.php

ecrire/tests/Filtre/Date/RecupDateTest.php

ecrire/tests/Filtre/Date/SecondesTest.php

ecrire/tests/Filtre/Date/ViderDateTest.php

ecrire/tests/Filtre/SecondesTest.php