Remove both the model and interface for RosterSets. These are no longer used

or necessary in the current data model.

Convert the test_handlers.py Python test to an acknowledge.txt doctest, and
make the Acknowledge.py handler work with the new data model.  There are a few
XXX comments left in here due to the fact that the web stuff is a total hack
in the current branch currently.

Added IMailingListWeb methods and properties to the MailingList model class:
web_host and script_url().

Work out how IMembers will expose the lookup-order based preferences.  By
getting the attribute IMember.preferences you can see exactly the preferences
overridden by this member.  To use the lookup order, use
IMember.delivery_mode, IMember.acknowledge_posts, etc.  IOW, the IMember
interface now provides the properties directly and access through this
mechanism supports lookup order with definitive preference values.

Also added IMember.unsubscribe() which does the obvious, and
IMember.options_url() which is a total hack for providing a url (but not the
ultimately right one) for the user's option page.

Refactor the model's roster classes.  Also added IRoster.get_member() method
with efficient queries to return the right results.  Make
AdministratorRoster.members more efficient due to a better query.

Update the membership.txt doctest to eliminate a chance ordering effect, and
also to test finding members with .get_member().   The clean up section uses
the new .unsubscribe() method.

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