Refs #4970 mechanism to validate all inputs before execution,

Code/Mantid/Framework/API/inc/MantidAPI/Algorithm.h

Code/Mantid/Framework/API/inc/MantidAPI/AlgorithmProxy.h

Code/Mantid/Framework/API/inc/MantidAPI/IAlgorithm.h

Code/Mantid/Framework/API/src/Algorithm.cpp

Code/Mantid/Framework/API/src/AlgorithmProxy.cpp

...k/DataHandling/inc/MantidDataHandling/LiveDataAlgorithm.h

Code/Mantid/Framework/DataHandling/src/LiveDataAlgorithm.cpp

Code/Mantid/Framework/DataHandling/src/LoadLiveData.cpp

Code/Mantid/Framework/DataHandling/src/MonitorLiveData.cpp

Code/Mantid/Framework/DataHandling/src/StartLiveData.cpp