units: disallow manual starting of passive units As passive units only are useful for ordering things within the initial transaction there is no point in ever activating them manually, hence refuse it.

units: there is no point in pulling in ordering 'provides'-style targets Units such as nss-lookup.target, nss-user-lookup.target, remote-fs-pre.target, local-fs-pre.target, time-sync.target, rpcbind.target are to be pulled in by the implementing services, and that's there only purpose. They should not have any 'active component' otherwise, so let's drop all further deps from these units.

units: introduce new Documentation= field and make use of it everywhere This should help making the boot process a bit easier to explore and understand for the administrator. The simple idea is that "systemctl status" now shows a link to documentation alongside the other status and decriptionary information of a service. This patch adds the necessary fields to all our shipped units if we have proper documentation for them.

relicense to LGPLv2.1 (with exceptions) We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.

units: introduce nss-user-lookup.target This separates user/group NSS lookups from host/network NSS lookups. By default order all network mounts after host/network NSS lookups now, and logind execution after user/group NSS lookups.