Features:
+* block setrlimit(RLIMIT_NOPROC) (and other per-user limits) in nspawn when userns is not on
+
+* nss-elogind: implement enumeration, that shows all dynamic users plus the
+ synthesized ones if necessary, so that "getent passwd" shows useful data.
+
+* teach tmpfiles.d q/Q logic something sensible in the context of XFS/ext4
+ project quota
+
* introduce DefaultSlice= or so in system.conf that allows changing where we
place our units by default, i.e. change system.slice to something
else. Similar, ManagerSlice= should exist so that PID1's own scope unit could
the entire system, with the exception of one specific service. See:
https://lists.freedesktop.org/archives/elogind-devel/2018-February/040369.html
-* check what setting the login shell to /bin/false vs. /sbin/nologin means and
- do the right thing in get_user_creds_clean() with it.
-
* maybe rework get_user_creds() to query the user database if $SHELL is used
for root, but only then.
* what to do about udev db binary stability for apps? (raw access is not an option)
-* maybe provide an API to allow migration of foreign PIDs into existing scopes.
-
* man: maybe use the word "inspect" rather than "introspect"?
* systemctl: if some operation fails, show log output?