evolve: move the extensions to 'hgext3rd' We have the 'hgext3rd' as the official place for extension for some time now. We start the big migration. This might break some people setup but this is a necessary step to have evolve easily available through pip.

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# name space package to host third party extensions

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from __future__ import absolute_import

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import pkgutil

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__path__ = pkgutil.extend_path(__path__, __name__)