I tried to adjust the doctest to ensure the traceback is not lost, but
as soon as I start it with a '...' (because I don't care about oldest frames),
the doctest comparator ignores everything about the traceback.

Fixes https://bugs.launchpad.net/zope.container/+bug/705600.

- checkName now checks the type first in checkName
- Convert most namechooser doctests into unittests
- Added more test cases

Add compatibility with ZODB3 3.10 by importing the IBroken interface from it directly. Once we can rely on the new ZODB3 version exclusively, we can remove the dependency onto the zope.broken distribution.

Copy two trivial classes from zope.cachedescriptors into this package, which allows us to remove that dependency. We didn't actually use any caching properties as the dependency suggested.

This fixes compatibility problems with zope.testing 3.8.4.

Move IXMLRPCPublisher ZCML registrations for containers from zope.app.publisher to zope.container for now.