Merge branch 'develop' of git@github.com:Dolibarr/dolibarr.git into develop

.travis.yml

build/debian/README.howto

build/debian/copyright

htdocs/admin/tools/export.php

htdocs/admin/tools/purge.php

htdocs/compta/facture/class/facture.class.php

htdocs/core/class/conf.class.php

htdocs/core/class/html.form.class.php

htdocs/core/class/utils.class.php

htdocs/core/lib/files.lib.php

htdocs/core/lib/functions.lib.php

htdocs/core/modules/DolibarrModules.class.php

htdocs/core/modules/modCron.class.php

htdocs/core/modules/modFacture.class.php

htdocs/cron/card.php

htdocs/cron/class/cronjob.class.php

htdocs/cron/list.php

htdocs/fichinter/class/fichinter.class.php

htdocs/install/mysql/migration/3.9.0-4.0.0.sql

htdocs/install/mysql/tables/llx_cronjob.sql