* The `bounceevent` table now uses list-ids to cross-reference the mailing

   list, to match other tables.  Similarly for the `IBounceEvent` interface.

Also:

- Move the acquisition of the database lock during creation to the
  IDatabaseFactory.create() method instead of the individual database
  initialize() methods.

- In the migration.rst doctest, don't delete teh version records when using
  SQLite, since that breaks tests.

- Implement a few nice helpers for database migrations, including
  make_listid() for turning a list name into a list id, and pivot() which
  simplifies moving the backup table to the final table name.

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