Merge: simplify class SimulationResult

Base/Axis/Frame.cpp

Device/Data/Datafield.cpp

Device/Data/Datafield.h

Device/Histo/SimulationResult.cpp

Device/Histo/SimulationResult.h

Sim/Fitting/SimDataPair.cpp

Sim/Simulation/DepthprobeSimulation.cpp

Sim/Simulation/OffspecSimulation.cpp

Sim/Simulation/ScatteringSimulation.cpp

Sim/Simulation/SpecularSimulation.cpp

Tests/Py/Functional/PolarizedNoAnalyzer.py

Wrap/Python/ba_fitmonitor.py

Wrap/Python/ba_plot.py

Wrap/Swig/libBornAgainSim.i

auto/Examples/fit/scatter2d/fit2d.py

auto/Examples/fit/scatter2d/model2_hexlattice.py

auto/Examples/fit/specular/Honeycomb_fit.py

auto/Examples/fit/specular/PolarizedSpinAsymmetry.py

auto/Examples/fit/specular/Pt_layer_fit.py

auto/Examples/specular/PolarizedSpinAsymmetry.py