[Python-3000] Should all iter(keys|items|values) be renamed?

[skip at pobox.com]

After Nick's last message I went searching for "iteritems" in the docs.  I
fixed a couple places (not yet checked in), but eventually came across
Mailbox.iteritems.  Looking at the mailbox.py code, sure enough, it still
exists:

    def iteritems(self):
        """Return an iterator over (key, message) tuples."""
        for key in self.keys():
            try:
                value = self[key]
            except KeyError:
                continue
            yield (key, value)

    def items(self):
        """Return a list of (key, message) tuples. Memory intensive."""
        return list(self.iteritems())

Should it be renamed items and the second def'n deleted?  Same for iterkeys,
itervalues where they appear?

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