Use getboolean for database list configuration

Otherwise the false value is still evaluated to true.

issue4404
review14781002
Remove Pool.object_name_list

This method is inefficient for testing existence of an item, it is better to
ask for forgiveness.

review12761002
Add wizard and state_name to StateView.get_view

This gives the same signature as for get_buttons and get_defaults. And so it
allows to customize the returned view base on the wizard state.

issue4406
review5861002
Fix documentation of ModelView.fields_view_get

review8811002