Add systemd unit files + some (other) lintian fixes
This MR started out as a fix for bug #1039226 about missing systemd unit files.
But while I was at it, fixed some other lintian issues as well:
- Replace old FSF address with URL
- Replace pkg-config build dependency with pkgconf
- Drop lsb-base dependency
- Bump debhelper-compat to 13
- Bump Standards-Version to 4.7.2, no changes required.
Signed-off-by: Diederik de Haas didi.debian@cknow.org