FPTracker: make IBeamline elements non-const
The beamline elements are being calibrated (e.g. collimator positions are determined) when setting up. Make them and the calibrate method non-const to avoid mutables.
Enable thread-checker.
The beamline elements are being calibrated (e.g. collimator positions are determined) when setting up. Make them and the calibrate method non-const to avoid mutables.
Enable thread-checker.