The Aggregator now transmits the capture timestamp of each packet to the
positioning server. For now this timestamp is not stored, only displayed
(in verbose mode) when a request is received.
To be consistent with the other modules, the positioning server must be
called OwlPS Positioner instead of Positioning, and the executable
owlps-positionerd (even if the daemon mode is not implemented yet).
That's a big commit for a tiny change.