Zodbbrowser

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- Fixed TypeError: int() can't convert non-string with explicit base
that could occur if no persistent objects were accessible from the request,
and no explicit oid was passed.

- Handle proxies better: when type(obj) != obj.__class__, show both.

- Handle ContainedProxy objects with their special persistence scheme.

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- IMPORTANT BUGFIX: don't leave old object states lying around in ZODB object
cache, which could lead to DATA LOSS (LP487243 strikes again, this time
for OrderedContainers).

I've audited the code and am fairly confident this bug is now dead dead
dead.

- Try to discard data modifications when the DB is opened read-only.

- Avoid deprecated zope.testing.doctest.

- Avoid zope.app.securitypolicy; use zope.securitypolicy.

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- Stopped using setuptools extras; now easy_install zodbbrowser is sufficient
to run the standalone app.

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- Compatibility with latest Zope packages, including ZODB 3.9.x.

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- Ability to revert object state to an older version. Requires a read-write
database connection (i.e. run bin/zodbbrowser --rw). The button is hidden
and appears when you're hovering over a transaction entry in the list.
- Collapse long item lists by default.

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- IMPORTANT BUGFIX: don't leave old object states lying around in ZODB object
cache, which could lead to DATA LOSS (LP487243). This affected OOBTree
objects.