Dialog w/options for Downloading Collections

[jmchilton]

From @stevecassidy on #2023.

Just wanted to comment on this. An important use case for us would be for the user to upload a collection of files, run some processing pipeline on them and download the result. We can preserve the element_identifier between processing steps, but then they can't download the resulting dataset. If they could, the filenames would have a useless (for us) prefix named for the dataset collection . Better would be to download this as a zip file with a directory structure, the directory could be the dataset name but the individual data files would be <element_identifier>..

Dialog could offer a preview of different zip/tar contents - allow options such as using name vs. identifier. I would think the identifier is fairly universally more useful - but there is a request for using the name in #1675. Dialog would also give an entry point in the GUI for poll from an offer final download link as things get zipped up in the background.