Merge branch '8.x' into kernel

core/MAINTAINERS.txt

core/includes/ajax.inc

core/includes/bootstrap.inc

core/includes/common.inc

core/includes/database/database.inc

core/includes/database/query.inc

core/includes/date.inc

core/includes/errors.inc

core/includes/file.inc

core/includes/form.inc

core/includes/gettext.inc

core/includes/graph.inc

core/includes/install.core.inc

core/includes/install.inc

core/includes/language.inc

core/includes/locale.inc

core/includes/menu.inc

core/includes/pager.inc

core/includes/registry.inc

core/includes/session.inc