in a graceful way, so that updated /usr trees automatically propagate into
updated boot loaders on reboot.
+* sysext: optionally, if the merged trees allow it use bind mounts instead of
+ overlayfs
+
+* nspawn: add support for sysext extensions, too. i.e. a new --extension=
+ switch that takes one or more arguments, and applies the extensions already
+ during startup.
+
* add "systemd-analyze debug" + AttachDebugger= in unit files: The former
specifies a command to execute; the latter specifies that an already running
"systemd-analyze debug" instance shall be contacted and execution paused