Auto-download ENSDF

[ferdymercury]

Improvement suggestion:

It would be nice to rescue the auto-download ENSDF function of the original nuclei SW, if requested by the user.

[martukas]

Maybe, but when working on this I strategically have used only a small subset of the entire DB to save on caching times. Maybe if there was a way to download but not cache all? Let the user select which subset of the database they want to be browsing?