Switch order of stopped_by= and cancel to avoid DB lock error.
Absolutely position toaster messages to avoid pushing content off page.
Fix word cloud options.
Add 'Twitter' to list of allowed import types.
Replace 'Reports' with 'Exports'. Allow requesting exports of filtered datasets.
Refactor BaseWorker out of import module.
Add export worker.
Remove unused class.
Add list of exports to dataset info view.
Define available filters in separate module instead of in NewFilterDialog.
Remove unused modules.