- Use 'del' instead of 'list.remove()' in
        Catalog.delColumn(). There can be only one column with the
        same name, and it could potentially break catalog metadata as
        remove() may remove more than one element from the list if
        they have the same value. Also, we already have the list index
        we are interested in deleting so it doesn't make sense to look
        up the value and call 'list.remove()' on it.

getlocale() returns a tuple here. The original test author obviously saw a
list returned so I'll explicitly tuplify to be on the safe side...

- fix for collector #1721

        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