There are a few problems with Zope 2.3 that prevented the tests from
succeeding.  Since the 1.0 release must support Zope 2.3, we'll need
to hack the various tests to work around them.

    Assuming releases after 1.0 don't need to work with 2.3: After the
    1.0 final release, I'll tag both ZEO and ZODB trees and then undo
    all these silly changes.

Problems:

    - no support for transactional undo or getSerial()
    - FileStorage commitVersion() and abortVersion() didn't check for
      bogus arguments