[Zope] repozo.py

[Dennis Allison]

We are (finally) moving to repozo for our backups.  We are running a mixed 
collection of Zopes -- mostly Zope 2.7.6, Zope 2.8.X and Zope 2.9.0.   For 
the near term we cannot move to a single release.  There are differences 
between the versions of repozo distributed with the different Zope 
systems.

I assume that the they are backward compatible and that the repozo.py 
shipped with Zope 2.9.0 is compatible with all variations of the Data.fs
format.



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