Merge the Pipermail eradication branch. The scrubber is also removed.

 * Configuration variable `[mailman]filtered_messages_are_preservable`
   controls whether messages which have their top-level `Content-Type`
   filtered out can be preserved in the `bad` queue by list owners.
 * Configuration section `[scrubber]` removed, as is the scrubber handler.
   This handler was essentially incompatible with Mailman 3 since it required
   coordination with Pipermail to store attachments on disk.

 * Schema additions:
   - mailinglist.filter_action

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