Make pylint happy by disabling globally and locally

.pylintrc

briar-gtk/briar_gtk/actions/actions.py

briar-gtk/briar_gtk/actions/add_contact.py

briar-gtk/briar_gtk/actions/application.py

briar-gtk/briar_gtk/actions/login.py

briar-gtk/briar_gtk/actions/registration.py

briar-gtk/briar_gtk/actions/window.py

briar-gtk/briar_gtk/containers/main_window.py

briar-gtk/briar_gtk/containers/private_chat.py

briar-gtk/briar_gtk/widgets/about_dialog.py