With systemd it's easy to manage several instances of picomon (via templated
units) so this should be quite usefull.
Also we switch to /etc/picomon for config (instead of %prefix%/etc/picomon)
as /usr/local/etc don't seem to exist for real and that way it's not abnormal
to ship the unit in /etc too. Also it's easier to manage the config at only
one place (think about etckeeper etc.).