* Correct binary package dependencies by referencing substvars in
debian/control.
+ * Add dependency on debhelper.
+ * No longer mention SLIP and udptunnel in the userv-ipif Description.
+ * Americanise spelling of /usr/share/common-licences to ...-licenses.
+ * Add debhelper token to postinst scripts.
+ * Change default user for git-daemon to userv-git and
+ default user for dyndns to userv-dyndns.
+ * Improve adduser calls:
+ - no longer guard with calls to id, as adduser --quiet is idempotent
+ - pass --shell /bin/false and --no-create-home
--