README: notice kernel config for CPUQuota
shared: time-dst - ensure nulstr is null terminated

Fixes CID #1237772.
shared: install - report error if mask symlink can not be marked for removal
delta: diff returns 1 when files differ, ignore this

https://bugs.debian/org/771397
nspawn: fix unused variable warning
man: update description of default extension for isolate
systemctl: add edit verb

It helps editing units by either creating a drop-in file, like
/etc/systemd/system/my.service.d/override.conf, or by copying the
original unit from /usr/lib/systemd/ to /etc/systemd/ if the --full
option is specified.

It invokes an editor on temporary files related to the unit files and
if the editor exited successfully, then it renames the temporary files
to their original names (e.g. my.service or override.conf) and
daemon-reload is invoked.

If the temporary file is empty the modification is canceled.

See https://bugzilla.redhat.com/show_bug.cgi?id=906824
man/logind.conf.xml: Make "man logind.conf.d" work too
man: Factor out a common snippet for .d directories and precedence

Several manpages contain duplicate text describing a standard set of .d
configuration directories, with the usual sorting, precedence,
overrides, and so on.  Factor this common text out using XInclude before
proliferating it even further.
core: Support system.conf.d and user.conf.d directories in the usual search paths
journald: Support journald.conf.d directories in the usual search paths
systemd-sleep: Support sleep.conf.d directories in the usual search paths
bootchart: Support bootchart.conf.d directories in the usual search paths
coredump: Support coredump.conf.d directories in the usual search paths
resolved: Support resolved.conf.d directories in the usual search paths
timesyncd: Support timesyncd.conf.d directories in the usual search paths
journald-remote,journal-upload: Support .d directories in the usual search paths
udev: strings in C are NUL-terminated anyway, no need to add a second NUL...
NEWS: Document new .conf.d configuration directories

Also provide guidance to distributions, to make sure they don't start
dropping files in the configuration directories in /etc/.
systemctl: remove unused variable