(#30): Enable to create, manage Group to LBE.
(#30): enable to add employee to group [FIXME: multivalue view & not finish].
(#30) use CharField instead of ChoiceField due to multivalue error.
(#30): Add ajax autocomplete user for group.
(#30): remove empty value from list
(#30): enable to remove group [backend]
(#30): Rename members into Groups when _id changed & improve the group definition & modification.
(#30): Improve Group management & modification (backend)
(#30): use Object function from the backend for group object.
Remove unused import.
(#30): set cn into changes.set when created Group.
(#30): add cn in changes.set if not exists
(#30): show 'No members' for empty group in view template.
(#30) get the GroupInstance from backend if exists.
(#30): reconciliation to Target is working (need to fix some bug).
Migrate directory.
(#30): rename the value member from group after reconciliation.
(#30): Improve groups' reconciliation
(#30): Fix bug for reconciliation & manage template.
(#30): Implement group into --import-target reconciliation.