UpdateOldVars(): Handle the migration of the old privacy variables to

the new ones.  I think this is as close as we can get:

- add default_member_moderation, accept_these_nonmembers,
  hold_these_nonmembers, reject_these_nonmembers,
  discard_these_nonmembers, forward_auto_discards,
  generic_nonmember_action

- moderated -> generic_nonmember_action, also if we were moderating
  this list, then the generic_nonmember_action should be to hold the
  message, otherwise it should be to accept it.

- for each address in forbidden_posters, if the address is a member,
  set their moderate flag to true, otherwise add them to
  hold_these_nonmembers.

- posters (fun! not.) and member_posting_only: if member_posting_only
  == yes and there are posters, then they are members and non-members
  we automatically accept.  So for members, turn off their moderation
  bit, and for non-members we add them to accept_these_nonmembers.

  BUT! if member_post_only == no, posters is the list of addresses we
  only accept, with all others being held.  So, first turn the
  moderation bit on for all members, then for addresses in posters
  which are members, turn their moderation bit off, and for addresses
  which are nonmembers, add them to accept_these_nonmembers.  Phew!

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