Reorganise the tests in order to really ignore calibration requests if
positioning.accept-new-calibration-requests = false and
positioning.position-calibration-requests = false.
Display a message when a calibration request is ignored.
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.
Matteo Cypriani