Updates the code to make it more easy to switch mediawiki version when testing. Before that, the version number was partly hardcoded, partly in a var. Signed-off-by: Benoit Person <benoit.person@ensimag.fr> Signed-off-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>