make "processing" notification more dynamic

[Andrew Su]

It is easy to miss the "processing" placeholder -- my initial thought was that no results were found. Make that more prominent? (perhaps with some commonly-used animated gif?)

[Richard Bruskiewich]

Throbber added to tabs of most data tables, as "processing" notification. Didn't add it to the main concept by text list view (but could, i guess;..)