convert: make contents of "extra" dict available from sources, for sinks. This breaks hash preservation for hg->hg conversion, as each converted change gets a convert_revision item added to its extra dict. Ugh.

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To run the tests, do:

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cd tests/

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python run-tests.py

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See http://www.selenic.com/mercurial/wiki/index.cgi/WritingTests for

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more information on writing tests.