misc bugfixes + attempt to really separate lists from the rest

misc bugfixes + attempt to really separate lists from the rest

* Banana :
    - show formular even after entering the password.

* Mail :
    - already add MailCOnfig because we really need to make @polytechnique.org disappear everywhere
      and make use of $globals->mail->domain instead.

* NewsLetter :
    - use globals->mail->domain

* Lists :
    - Make it a separate module : really ok for the php part.  Needs work for the rpc, but I cannot test atm.

git-archimport-id: opensource@polytechnique.org--2005/platal--mainline--0.9--patch-34