Save locally only connections identities

src/sakia/data/graphs/base_graph.py

src/sakia/data/graphs/wot_graph.py

src/sakia/data/processors/connections.py

src/sakia/data/processors/identities.py

src/sakia/data/repositories/connections.py

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

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

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

src/sakia/gui/navigation/network/table_model.py

src/sakia/services/identities.py