20160628 [r10462] varfilter interface display only if one variable filter exists (FG)
20160413 [r10001] use new technical variable (FG)
20160412 [r10000] error message in standard format (FG)
20160412 bugfix : real forbidden access to module when user is not supervisor of class (FG)
20141010 :
  In class: if the mails are not send to all the students, their list is added to the
   message send to other teachers.
20120622: fix filter

------------------------ version 2.01
20100308: use of script/js/chooselist.js au lieu du fichier local js (FG)
2010-02 : Version 2.00
  This module replaces several previously existing module adm/sendmail.fr.
