+ systemctl shouldn't be called from maintainer scripts, as systemd may be not running during install (upgrade from legacy system, chroot etc)
+ use builtin dh_systemd_enable and dh_systemd_start from debhelper 10
+ bump debhelper compat to 10 (available as default on Debian Stretch, even available on Debian Jessie in backports)
+ hardcoded a list of packages that may use dh_systemd_* extensions to avoid issues - there is no other way of excluding other packages from using the extensions
+ minor maintainer-clean.sh improvement
+ probes-server becomes the new default instead of pserver-lite, as it is more stable in large configurations