Code review comment for lp:~gero-bare/noise/fix-1181327

Blacklisting only would exempt files from the auto-import process. The "blacklist" is in the event of unwanted items being auto-imported.

All the "blacklist" is, is the list any and all files that a user has manually removed from his/her library.

I.e. when a user hits "Remove from Library" on an item in their Library, it's added to the blacklist (along with being removed) and to remove said item from the blacklist all they needs to do is re-import it from the gear menu.

Also, this shouldn't require any new user interface elements.