update the default theme, add correct behavior to tabs and subtabs
 - the subtabs are in the process of being styled
 - the current mechanism should work for both horizontal and vertical tabs
 - the state of the tabs has been put in the application instead of a class variable, because otherwise the rails stack may obliterate the class variable in development
 - clean old setup routes, controlers and views
 - not done Shares tab yet (still using old way to display subtabs)
 - update users to not have multiple public_key ids in the forms