NXP-15145: review management of labels on directory select items + better doc of widgets for layout-demo and Studio export
NXP-15145: better handle case where SelectItem instances are looked up for resolution of labels (avoid breaking shuttle-like widget behaviour on advanced search)
NXP-15145: provide docCount even if directory entry is not resolved
NXP-14992: remove advanced and simple search related contributions
NXP-15053: move 'search_listing_ajax' layout to nuxeo-search-ui
NXP-14992: remove advanced search local configuration test
NXP-15010: add selectManyCheckboxUserAggregate widgetType
NXP-15010: add contentView searchLayout widget control insert