Search User Widget is back

src/sakia/data/connectors/node.py

src/sakia/data/entities/identity.py

src/sakia/data/processors/identities.py

src/sakia/gui/dialogs/certification/controller.py

src/sakia/gui/dialogs/certification/view.py

src/sakia/gui/navigation/graphs/wot/controller.py

src/sakia/gui/sub/search_user/controller.py

src/sakia/gui/sub/search_user/model.py

src/sakia/services/documents.py