[issue5736] Add the iterator protocol to dbm modules

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

skip> What's worse, even in a non-threaded environment you might want to
    skip> iterate over the gdbm file simultaneously from two different
    skip> places.

Or iterate over two different gdbm files simultaneously.

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<http://bugs.python.org/issue5736>
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