Move ProcessedSample to IComputation

Core/Computation/DWBAComputation.cpp

Core/Computation/DWBAComputation.h

Core/Computation/DepthProbeComputation.cpp

Core/Computation/IComputation.cpp

Core/Computation/IComputation.h

Core/Computation/SpecularComputation.cpp

Core/Multilayer/MultiLayer.cpp

Core/Multilayer/MultiLayer.h

Core/Multilayer/MultiLayer.h.autosave

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp