units: don't fail if /root doesn't exist for shell units As discussed on the ML: http://lists.freedesktop.org/archives/systemd-devel/2016-January/035594.html

build-sys: lookup for sulogin, it might not be in /sbin

core: optionally send SIGHUP in addition to the configured kill signal This is useful to fake session ends for processes like shells.

units: drop distro specific stuff from units Since rc-local is now enabled via the SysV compatibility we should only refer to it based on that too.

units: teach m4 scripts in units/ about Debian's rc.local This makes the behaviour wrt. to rc[-.]local consistent between various distributions supporting it.

man: add Documentation= tags to all kinds of missing units

service: introduce Type=idle and use it for gettys Type=idle is much like Type=simple, however between the fork() and the exec() in the child we wait until PID 1 informs us that no jobs are left. This is mostly a cosmetic fix to make gettys appear only after all boot output is finished and complete. Note that this does not impact the normal job logic as we do not delay the completion of any jobs. We just delay the invocation of the actual binary, and only for services that otherwise would be of Type=simple.

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/: use @SYSTEMCTL@ instead of hardcoded paths Especially in the case of --enable-split-usr, several units will point to the wrong location for systemctl. Use @SYSTEMCTL@ which will always contain the proper path.