Add init without calibration option (for tests...)

include/dsl/ContinuousAI.h

include/dsl/Digitizer.h

include/dsl/acqiris/AcqirisDigitizer.h

src/ContinuousAI.cpp

src/Digitizer.cpp

src/acqiris/AcqirisDC252.cpp

src/acqiris/AcqirisDigitizer.cpp