Create the stdalgo namespace for container-related algorithms, add stdalgo::vector::swaperase()
Make it possible to customize how SimpleExtItem should delete items
Cull ident sockets instead of immediate delete, add stdalgo::culldeleter
Add stdalgo::delete_all() that deletes all elements in a container
Add typedef OperList to UserManager for use with all_opers
Change storage of UserManager::all_opers to be a vector