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This PR moves the code generating the data for 3D+time tests and examples into a helper function, which can be reused.
The changes are currently applied only to rtkfourdroostertest.cxx, but can be propagated to the other 3D+time tests.
The PR also adds the 4D conjugate gradient C++ example, using the helper function to generate the data.
If it is fine for you, I will add the other examples as additional commits on this same PR.