Batch labelling based on search result

[np]

I would like to label/unlabel a whole set of thread all at once by specifing query and a set of signed (+/-) labels.
Currently the loop is done on the client which is really inefficient, moreover using turnsole its not possible to really select all the threads of a search result.

[rakoo]

I've done some work about this in my branch : https://github.com/rakoo/heliotrope/tree/filter

It manages every thread that is searchable, but the looping is done on the client.