TODO
----
-
+- track energy usage rate
- formalize message format and protocol
- tests (design is starting to take shape, so it is time)
- show how many Debian package updates are available
- report history and trends on when and how-often each
device/category is plugged-in, how-long it stays plaugged-in, etc.
- daemonize `khatus`, so we don't have to re-launch `X11` to re-launch `khatus`
-- interoperate with other khatus instances
+- interoperate with other khatus nodes
- prefix machine ID to each data source
(What should that ID be? Hostname? Pub key?)
- fetch remote data and process locally