convert: some tidyups, doc improvements, and test fixes
The various back end options are now documented.
The hg source can now be configured not to hand out a revision ID.
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fb4b6d5fe100b0886f8bc3d6731ec0e5ed5c4694 0.9.4
23889160905a1b09fffe1c07378e9fc1827606eb 0.9.5