A couple of bug fixes to the emails, and add a MembershipInfo() which invokes the same named method on the default group (for convenience).
A couple of bug fixes to the emails, and add a MembershipInfo() which
invokes the same named method on the default group (for convenience).

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome