support directory structure visualization of transfered data files

[pameyer]

Data files transferred through the Data Capture Module, data sets with data files that have directory structure available should display that structure.

Related to #2249, but distinct in that this doesn't require supporting re-organization of uploaded files (and possibly should support disabling such an option in the UI).

[mheppler]

Closing this issue in favor of #2249. Your comments, @pameyer, will be copied over, to make sure we deliver a feature that supports your use case.