[Koha-translate] new doc (in french)

Hi Stephen, I've commited a new doc (in french), called "command line scripts", in koha-doc/fr/scripts ligne de commande.xml. Pls add it to www.kohadocs.org, and translators, feel free to translate it to english. -- Paul POULAIN Consultant indépendant en logiciels libres responsable francophone de koha (SIGB libre http://www.koha-fr.org)