- clarified dan s's clarifications of the difference between domains and

- clarified dan s's clarifications of the difference between domains and
  workgroups (domains are a superset of workgroups: workgroups have no
  concept of security at all)

- updated comments about profiles from conversations with john t, and from
  samba digest input.  this includes the need for encrypted passwords when
  supporting NT workstation, and enlisting the assistance of an NT server
  to tell workstations that their profile is on a samba server.

lkcl