Iter bliss data stop index

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• df194d69 - stop index

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This way we can iterate between specific ranges within the.h5 files

assigned to @edgar

requested review from @denolf

I would expect something like this but maybe I misunderstand the intention.

if index > stop_index:
    break
if index >= start_index:
    yield index, data

yes, exactly, otherwise, it continues the loop doing nothing

        if start_index is None and stop_index is None:
            names = list(datasets.keys())
            for values in zip(*datasets.values()):
                yield dict(zip(names, values))
        elif start_index is None and stop_index is not None:
            names = list(datasets.keys())
            for i, values in enumerate(1, zip(*datasets.values())):
                yield dict(zip(names, values))
                if i == stop_index:
                    break
        elif start_index is not None and stop_index is None:
            raise NotImplementedError
        else:
            for i in range(start_index, stop_index):
                yield {name: dset[i] for name, dset in datasets.items()}