Features:
+* nspawn's console TTY should be allocated from within the container, not
+ mounted in from the outside
+
+* show invocation ID in systemd-run output
+
+* bypass SIGTERM state in unit files if KillSignal is SIGKILL
+
+* tree-wide: ensure we always block the signals we hook into with
+ sd_event_add_signal() first
+
* add proper dbus APIs for the various sd_notify() commands, such as MAINPID=1
and so on, which would mean we could report errors and such.