Monitor for background upload/download

[bobonov]

When uploading/downloading files is impossible to see if the task is ended. This is a problem especially for "big" operation (many files and/or big files) as it is impossible to see if the transfer ended

Probably adding in file browser a new section at the bottom (which can be made visible/hided by clicking) that resume the background download/upload status is a possible solution.

[devlinx9]

When you click in the upload/download Buttons you can see the progress, however, there is some information that is missing about the files