Features:
+* .device aliases need to be implemented with the "following" logic, probably.
+
+* add sd_journal_wait() to make things easier for sync programs that just want to wait for changes
+
+* refuse taking lower-case variable names in sd_journal_send() and friends.
+
+* when running as user instance: implicitly default to WorkingDirectory=$HOME for all services.
+
* journalctl highlight reboots
* Merge KillUnit()'s mode and who params into one