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Exporting to h5 files gives unexpected results when exporting a view #180

@spectre-ns

Description

@spectre-ns

See the code snippet below:

int main()
{
	auto [a, b] = xt::meshgrid(xt::arange(10), xt::arange(10));
	auto a1 = xt::eval(a);
	auto b1 = xt::eval(b);
	using namespace std::complex_literals;

	auto v = xt::view(a1, xt::all(), xt::range(2, 4));
	xt::dump_hdf5("test.h5", "dataset_a", v);
	std::cout << v;
}

The output from std::cout does not match the result in the file. The implementation will accept any input presenting the T::data(). The data interface from the view does not add an offset into the valid region and simply yields a begin pointer to the underlying container.

Expected result:
{{2, 2, 2, 2, 2, 2, 2, 2, 2, 2},
{3, 3, 3, 3, 3, 3, 3, 3, 3, 3}}

Result:
0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1

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