py3: making heptapod extension installable
This is the minimum so that Mercurial accepts to load it. In turn the heptapod extension is used as an example of how to load an extension in tests in `test_testhelpers`, so this intermediate change is needed to port testhelpers to Python3. Of course we should use another extension, perhaps one shipping with Mercurial so that testhelpers don't depend onto hgext3rd.heptapod any more, but that will be another day.
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