Transaction

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- Add support for Python 3.7.

- Reach 100% test coverage.

- Fix ``transaction.manager.run`` formatting transaction notes when
given a mix of byte and text strings, such as can happen in Python 2
with ``unicode_literals``.

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- Make documentation index more user friendly; move old docs to developer
section.

- Don't crash when printing tracebacks in IPython on Python 2.
(This addresses https://github.com/zopefoundation/transaction/issues/5.)

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- Add support for Python 3.6.

- Drop support for Python 3.3.

- Add ``isRetryableError`` to the
``transaction.interfaces.ITransaction`` interface to allow external
systems to query whether an exception is retryable (transient) by
any of the attached data managers. Any
``transaction.interfaces.TransientError`` is considered retryable
but a data manager may also consider other exceptions on a
per-instance basis.

See https://github.com/zopefoundation/transaction/pull/38

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- To avoid leaking memory, don't include unexpected value in warnings
about non-text transaction meta data.

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- For backward compatibility, relax the requirements that transaction
meta data (user or description) be text:

- If None is assigned, the assignment is ignored.

- If a non-text value is assigned, a warning is issued and the value
is converted to text. If the value is a binary string, it will be
decoded with the UTF-8 encoding the ``replace`` error policy.

==================

Added a transaction-manager explicit mode. Explicit mode makes some
kinds of application bugs easier to detect and potentially allows data
managers to manage resources more efficiently.

(This addresses https://github.com/zopefoundation/transaction/issues/35.)