new Py fcts run_and_plot, save_and_plot to make examples and checks a bit simpler

Core/Export/ExportToPython.cpp

Core/Export/ExportToPython.h

Core/Export/SampleToPython.cpp

Core/Export/SampleToPython.h

Core/Export/SimulationToPython.cpp

Core/Export/SimulationToPython.h

GUI/coregui/Views/InfoWidgets/PySampleWidget.cpp

GUI/coregui/Views/SimulationWidgets/PythonScriptWidget.cpp

Tests/Functional/Python/PyEmbedded/Tests.cpp

Tests/Functional/Python/Std/Check.cpp

Wrap/Python/plot_utils.py

auto/Wrap/doxygenCore.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp