* Switch to source format "3.0 (quilt)"
* Add patch to fix FTBFS with -Werror=format-security
* Use debhelper (v9) in many places, add build-dependency
* Switch to source format "3.0 (quilt)"
* Add patch to fix FTBFS with -Werror=format-security
* Use debhelper (v9) in many places, add build-dependency