implementing deletion of a user

implementing backend method for delete user

fix adding multiple time to same group + logs

code reorganization + logs ...

* adding logs when adding users
* move adduser with other none exposed classes
* skeleton for modify and delete user

better logs

implementing displaying roles and standalone groups in modify form

begin implementing modify user form

implementing adding user to roles

adding logs when adding a user to a group

list of roles and not a uniq role for get_groups

adding exception to prevent using skeleton module

fix backend module skeleton

fix unit test and fix the way ldap connexion options are handled

fix add/del groups

fix API for backend ldap on groups handling

multiple modification in backend ldap ...

* better handling of which attributes is recovered
* fix set_attrs method
* change api of set_attrs method for constancy
* change calls to _get_user and _search methods (internal api change)

remove debuging log

fix search display ...

* fix attritues handling, not using backend attribute name but key given
  in attributes.yml

implementing basic add of users

implementing modify and add/rm to groups

adding notification on addes user

implementing notification to explain automatic adding of roles

adding js to better handle parent/sub roles ...

now js functions automatically enables parent roles of a selected
roles, and disables sub roles unselected role

fix unit tests + add graph method ...

* fix unit tests on roles (adding mandatory description)
* adding a method to get roles graph in json

adding descriptions for roles

implementing conditional navbar ...

* implementing navbar that displays actions the user is authorized to do

implementing roles switchs on forms

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