Getfile methods no longer return erronous strings+

program/Source/app/Application.cpp

program/Source/app/UI.cpp

program/Source/app/UI.h

program/Source/dataAccess/Cache.h

program/Source/dataAccess/CloudFileSystem.cpp

program/Source/dataAccess/CloudFileSystem.h

program/Source/dataAccess/ComputeOnClient.cpp

program/Source/dataAccess/ComputeOnClient.h

program/Source/dataAccess/ComputeOnPi.cpp

program/Source/dataAccess/ComputeOnPi.h

program/Source/dataAccess/ConcreteCache.cpp

program/Source/dataAccess/ConcreteCache.h

program/Source/dataAccess/Decoder.cpp

program/Source/dataAccess/Decoder.h

program/Source/dataAccess/HomeNetworkBehaviour.h

program/Source/fileModel/ReturnableFile.cpp

program/Source/fileModel/ReturnableFile.h