[enhancement] Folder information

[kurgans0]

When we drag-and-drop a many files, folder or both, all files are analyzed > ok.

But only files are present today when we click on "recent" (tasks page).
No information about folder (subfolders) to have a resume of status.
And there is not a final resume of all the items sent in the same push to Pandora.

In the case where it push more one (1) file, do you think it's possible to add:

• [optional] a "fake" id for each folder sent
• a final resume of the push

Comment:
The most important is to have a final resume, and this resume is "Overall Result" display

[Rafiot]

The way Pandora handles submissions right now is by assuming we only have one file in one submission, so a directory should probably be handled the same way as an archive, but I didn't considered it as an option until you mentioned it (see #165), so let's see how that can be implemented cleanly.