Trigger finalizing UploadProgress, after file status is set to plupload.DONE.

Because internal UploadProgress handler on it's turn does complete
progress recalculation for the file and the whole queue.
If unique_names is true, generate names on BeforeUpload rather than on UploadFile.
UI: Adequately handle multiple_queues: false.
Queue: Handle multiple_queues: true on StateChanged, instead of UploadProgress. Close #813. Address: #819.

What was the point anyway?
UI: Show cursor pointer only on top of files that can be removed.