tests: tests de xml 'hack' en phpunit

ecrire/tests/Xml/XmlHackTest.php

ecrire/tests/Xml/data/xmlhack.html

ecrire/tests/Xml/data/xmlhack_inclure.html

ecrire/tests/Xml/data/xmlhack_inclure_dyn.html

ecrire/tests/Xml/data/xmlhack_inclure_dyn_php.html

ecrire/tests/Xml/data/xmlhack_inclure_php.html

ecrire/tests/Xml/data/xmlhack_php.html

ecrire/tests/legacy/unit/xml/xmlhack.html

ecrire/tests/legacy/unit/xml/xmlhack_fonctions.php

ecrire/tests/legacy/unit/xml/xmlhack_inclure.html

ecrire/tests/legacy/unit/xml/xmlhack_php.html

ecrire/tests/legacy/unit/xml/xmlhack_php_fonctions.php

ecrire/tests/legacy/unit/xml/xmlhack_recuperer_fond.php