Search : add case where there are several element in the search input array. Add display of total number of document found and shown. Mainly for test purpose, maybe to be removed for production

(gives the possibility to choose auto-size auto-degree or louvain for only one type in mixed views

spec: Si S est ma sélection et S_t et S_s respectivement les termes et les scholars liés aux éléments de S, dans une vue meso, on doit pouvoir afficher S U S_t ou S U S_s selon que l'on change de type.