Features:
+* busctl: add a pcap writer, using LINKTYPE_DBUS/231
+
* man: maybe use the word "inspect" rather than "introspect"?
* introduce machines.target to order after all nspawn instances
- implement reconfigure support, see 5.3., 15.11. and 22.20.
- implement information request, see 1.2. and 18.1.5.
- implement support for temporary adressess (IA_TA)
- - implement elapsed time option
- implement dhcpv6 authentication
- investigate the usefulness of Confirm messages; i.e. are there any
situations where the link changes without any loss in carrier detection