* debian/patches: - xubuntu_single-click-option.patch: clean up autogenerated .h file. - xubuntu_use-tumbler.patch: refreshed, based on the latest version from upstream bug report. - xubuntu_refreshed-translations.patch: refreshed, new translations taken from Thunar as the added string to show thumbnails is also used there. * debian/rules: - regenerate and clean autogenerated settings/*ui.h. - drop obsolete configure option. - use debhelper 9 hardening support. * debian/compat bumped to 9. * debian/control: - b-dep on exo-utils for exo-csource. - drop hardening-includes build-dep. - update debhelper build-dep to 9 for hardening support. - add dpkg-dev 1.16.1 build-dep for hardening support.