Features:
+* logind: make PrepareForSuspend(false) an official api for notification of resumes
+
+* ExecStartPre= with an empty string should reset the list of commands to invoke
+
+* refuse instantiation of proc.mount and mount units for all other API fs
+
* "systemctl disable" on a static unit prints no message and does
nothing. "systemctl enable" does nothing, and gives a bad message
about it. Should fix both to print nice actionable messages.