Zodbbrowser

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- Stop depending on the obsolete ZODB3 metapackage from 2012. Instead
depend directly on persistent, BTrees, ZODB, and ZEO.

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- Dropped Python 3.4 support.

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- Add support for Python 3.7.

- Add support for PyPy and PyPy3.

- Support zope.security proxies in PURE_PYTHON mode.

- Use our custom __repr__ instead of the new persistent one.

- Transaction IDs in generated URLs are now in hex.

- 100% test coverage.

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- Add support for Python 3.4, 3.5, 3.6.

- Drop support for ZODB 3.8.

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- Fixed zodbbrowser_history with recent versions of ZODB (AttributeError:
MVCCAdapterInstance doesn't have attribute ``iterator``).

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- Dropped Python 2.6 support (because ZODB---more specifically BTrees---dropped
it).

- Fixed rollback to work with ``transaction`` >= 2.0 (transaction notes must be
Unicode now).