Adapt to changes in libheinz (Vec3 member fcts moved to R3Util)

Device/Coord/CoordSystem2D.cpp

Resample/Element/DiffuseElement.cpp

Sample/Material/MaterialUtils.cpp

Tests/Unit/Sim/RectangularDetectorTest.cpp

auto/Wrap/libBornAgainBase.py

auto/Wrap/libBornAgainBase_wrap.cpp

auto/Wrap/libBornAgainDevice.py

auto/Wrap/libBornAgainDevice_wrap.cpp

auto/Wrap/libBornAgainResample.py

auto/Wrap/libBornAgainResample_wrap.cpp

auto/Wrap/libBornAgainSample.py

auto/Wrap/libBornAgainSample_wrap.cpp

auto/Wrap/libBornAgainSim.py

auto/Wrap/libBornAgainSim_wrap.cpp