listings did not work)

failures during the Zope startup phase caused by the index cleanup in Zope 2.8

- browser for stored values for all UnIndex derived indexes

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- refactored batch size

the extra argument. Its parameter 'indexed_attrs'
can be string with comma delimited attribute names
or list/tuple

This fixes: # 1688

- len(self._unindex) as used in numObjects() might take too long

Import of the Zope package is now deprecated, but will
be supported until Zope 2.11.

Changed all imports of and references to the Zope to use Zope2 instead.