content-type header included a 'charset' parameter.

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.

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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!