Got rid of it in the Zope source.  The remaining instances are in
code stitched in from ZODB.  Those will go away by magic when
ZODB 3.4 gets stitched in.

No commit message

of its parents is not accessible, to be close to what the Publisher does.

- Revert my previous two checkins, they are rather broke with ZODB 3.3

      - Applied patch for
        http://www.zope.org/Collectors/Zope/1527. The patch
        installs a windows 'control handler'. Ctrl+C/Break etc are
        delivered asynchronously (notwithstanding the GIL) to a new
        thread. This new thread triggers a shutdown, then tricks
        asyncore into breaking out of its 'select' call.

      - The ZEO server now records its PID to a file like the ZEO
        client. Defaults to /var/ZEO.pid, and its
        configurable in /etc/zeo.conf.

- Merge a fix from the five-integration branch, with a test.

- Merge a fix from the five-integration branch, with a test.

- Fixed Shared.DC.ZRDB.{RDB|Results} to behave nicely with the new-style extensionclass
- Added a minimal test

Note that doctest support is not done yet!