Repair the usermanager.txt and listmanager.txt doc tests. These repairs were

necessary to deal with the simplified user model.  Eradicate more references
to rosters and roster sets.

Give Users a repr.  Also give them a belongs_to() link to Preferences, but
change the user manager to not give a user preferences by default (the lookup
schema should properly handle users with no preferences now).

Also, when creating a user, set their real_name to the empty string if no
real_name argument was given to create_user().  Update the IUserManager
interface's create_user() method to match the implementation.

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