Fix tests and app startup

src/sakia/data/files/user_parameters.py

src/sakia/data/repositories/connections.py

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

src/sakia/options.py

src/sakia/tests/functional/test_certification_dialog.py

src/sakia/tests/functional/test_connection_cfg_dialog.py

src/sakia/tests/technical/test_documents_service.py

src/sakia/tests/technical/test_network_service.py

src/sakia/tests/unit/core/__init__.py

src/sakia/tests/unit/core/test_application.py

src/sakia/tests/unit/core/test_wallet.py

src/sakia/tests/unit/core/txhistory/__init__.py

...sakia/tests/unit/core/txhistory/test_txhistory_loading.py

src/sakia/tests/unit/data/test_node_connector.py

src/sakia/tests/unit/gui/test_context_menu.py

src/sakia/tests/unit/gui/test_generic_tree.py

src/sakia/tests/unit/gui/test_main_window.py

src/sakia/tests/unit/money/__init__.py

src/sakia/tests/unit/money/test_quantitative.py

src/sakia/tests/unit/money/test_quantitative_zsum.py