implementing adding default values to form

implementing a method to get groups to remove ...

* implement a way to remove roles from a user
  without removing groups of roles the user keeps

implementing oriented graph for roles

create reverse structure to deduce which roles a group belongs

removing trailling spaces

copying dictionnary

adding a flatten method in roles

simplify roles configuration (backend groups)

adding self modify page

implementing weight and normalizing each kind of attributes

adding form and better handling of search without results

adding not admin search

implement search

adding key handling

adding key and fixing unit tests

cleaning ldapcherry class

implementing 'none' authentification (no authentification)

adding a search page dedicated for admin

fix authentification and permission handling

reorganize the ldap backend module

correct backend module skeleton

implementing logout

implementing access controle methods

add exception handling

implement get_groups

fix logging in ldap backend

implement authentification

reimplement get_user in ldap backend

adding methods add_user and del_user ...

* adding add_user
* adding del_user
* adding unit tests
* adding configuration parameters for adding users

adding objectclasses options