Version 3.00 : 2012-03
  External authentification and identification are implemented.

-----------------------------------------------------------  version 2.02
20120224 bugfix when registration in a class with existing login (FG)
20120224 add link return when error (FG)
20120224 improvement : verify CGU at step=2 (FG)
-----------------------------------------------------------  version 2.01
20110710 user need accept CGU to register in a class (FG)
2010-02 : Version 2.00
  This module replaces several previously existing language dependent modules adm/class/reguser.xx
  of Gang Xiao. It has been constructed by localization of these modules, keeping a single 
  computation core and adding dictionaries.
