Resolve "Datatable nb items"

Closes #44

See merge request !43

Refactor detail page

See merge request !42

Sample dataset

See merge request !41

Webpages

See merge request !40

Resolve "Réorganisation criterion (null, not null)"

Closes #41

See merge request !38

remove null/not null select box, add null and not null in operators date, datetime,json,svomjson search_type

datalist search type :move null and not null in operator select list, and manage no dynamic operator case