NXP-12050: make buttons smaller in toggleable widgets
NXP-12018: make js scripts are included when some select2 widgets are not rendered
12018: make the converted list modifiable
12018: add support for prefixed users and groups
12018: format
NXP-12264: turn user_group_prefixed_suggestion, user_group_suggestion and groups widgets into select2 widget
NXP-12320: turn coverage, subjects and nature widgets into select2 in advanced search
NXP-12018: move select2 to nuxeo-features to avoid dependency cycles
NXP-12320: set select2 nature and coverage search criteria multiple
NXP-12264: add display labels and customize placeholder for user/group suggestion