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

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