Restore ability to add blacklists in bulk

I just saw your comment for that pull request

Also, we remove the redundant list management from the settings page as this code was only partially migrated to the database backend (it was planed to be replace, anyway) and still uses CLI callbacks in the background. It is not needed any longer. I added a link to the new page so users will not be confused by a sudden absence of the settings tab.

Why not go a step further: remove Whitelist and Blacklist from the side-panel as well? One can do the same configuration (and even more) in Group management/Domains. Its kind of confusing to have two places for setting up white- and blacklists. In the end white/blacklists displaying just filtered information from the Group management/Domain table. You could also combine it with what if suggested here: add the ability to filter the list, not just sorting it. This would "restore" the classical white/blacklist view by only display selected items.

Impression what I mean with filter: