Zodb.py3migrate

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- Nothing changed yet.

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- Update requirements to ``ZODB >= 4`` as with an older version the migration
cannot be done successfully.
(`13 <https://github.com/gocept/zodb.py3migrate/issues/13>`_)

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- Release as wheel and include all files in release.

- Ensure compatibility with ``setuptools >= 30``.

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- Fix brown bag release.

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- Fixes for issues 4 and 5: Converted ZODB ist now actually saved,
using additional subtransactions improves the memory footprint.

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- Split up the two functions previously united in the script
``bin/zodb-py3migrate`` into ``bin/zodb-py3migrate-analyze`` resp.
``bin/zodb-py3migrate-convert``.

- Add new options to the analysis script:

- ``--start`` to start the analysis with a predefined OID.

- ``--limit`` to stop the analysis after a certain amount of seen OIDs.