Neuroc

- Update NeuroM dependency to version >= 3
- Use pytest for tests instead of nosetests

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- Allow to pass numpy rangom generators ``yield_clones``.
- Fix the recursive pass of ``rng`` in ``scale_section``, ``_recursive_rotational_jitter``

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- Allow to pass numpy rangom generators to jitter functions

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- create_clones renamed to iter_clones. It now returns a generator of morphio.mut.Morphology clones.

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- Add Scaling CLI

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- Remove tqdb progress bar when running create_clones