More fixes to get end-to-end delivery basically working.

- Add a VirginPipeline for the virgin queue, which is mostly the same as the
  BuiltInPipeline, so refactor the commonality into a BasePipeline.
- Simplify and update bin/dumpdb.
- Rename inject() to inject_text() and add inject_message().  Both interfaces
  will be useful.
- When enqueuing and not using _plaintext, use the highest pickle protocol
  supported.
- Fix the archive runner's calculation of whether to clobber the message's
  Date: header.
- Fix the outgoing queue's deliver_after calculation.
- Update the virgin queue runner.  It doesn't need to inherit from
  IncomingRunner any more; it can just execute the 'virgin' pipeline.

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