updated swig interface to fix issues with std::shared_ptr

Core/Algorithms/inc/ISampleBuilder.h

Core/PythonAPI/libBornAgainCore.py

Core/PythonAPI/libBornAgainCore_wrap.cxx

Core/PythonAPI/libBornAgainCore_wrap.h

Core/Tools/inc/INamedShared.h

Core/Tools/inc/IParameterizedShared.h

Core/Tools/src/INamedShared.cpp

Core/Tools/src/IParameterizedShared.cpp

Fit/PythonAPI/libBornAgainFit.py

Fit/PythonAPI/libBornAgainFit_wrap.cxx

Tests/PerformanceTests/customformfactor.py

dev-tools/swig/extends.i

dev-tools/swig/libBornAgainCore.i

dev-tools/swig/libBornAgainFit.i

dev-tools/swig/shared_pointers.i