clean out column anonymous labeling rules

I.e. we want to remove:

    def label(self, name):
        if name is None:
            return self
        else:
            return super(ColumnClause, self).label(name)

from ColumnClause, so that:

c1 = column('x')
assert c1.label(None) is not c1

works as expected, instead of returning self, which doesn't make any sense. The logic within _Label should be enhanced to be smarter about when it chooses name and when it doesn't. Ideally the same result should always occur for label(c, None) versus c.label(None).

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