- converted from zsh to bash
- fixed path to helpers
- using REMOTE mailman via ssh
- new member importer using mailman-subscribers3.py to generate a
  dumpfile for restore_user, now supporting all kinds of digest,
  nomail, notmetoo and hide flag, mod flag also possible but not yet
  supported in sympa
- dropped notify_owner stuff

it's still very general, but previously it broke multiline html

previous privatekeyandeditorkeyonly discarded mails from persons not on
the list. This may be wrong depending on the use case. Now everything is
moderated.