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

htdocs/core/db/mysqli.class.php

htdocs/core/lib/usergroups.lib.php

htdocs/install/mysql/migration/3.8.0-3.9.0.sql

htdocs/install/mysql/tables/llx_user_rib.sql

htdocs/theme/md/graph-color.php

htdocs/theme/md/img/calendar.png

htdocs/theme/md/img/close.png

htdocs/theme/md/img/close_title.png

htdocs/theme/md/img/delete.png

htdocs/theme/md/img/disable.png

htdocs/theme/md/img/edit.png

htdocs/theme/md/img/edit_add.png

htdocs/theme/md/img/edit_remove.png

htdocs/theme/md/img/editdelete.png

htdocs/theme/md/img/error.png

htdocs/theme/md/img/file.png

htdocs/theme/md/img/filenew.png

htdocs/theme/md/img/filter.png

htdocs/theme/md/img/folder-open.png

htdocs/theme/md/img/folder.png