[imp] Drag and drop

[c.bayerlein at bundesarchiv.de]

Hi Ralf,

> As somebody who has done heavy customisation/hacking on DIMP H3 for a
> German authority, I can assure you the difference between the
> standalone DIMP app and the DIMP view in H4 and the Horde 5 Ajax
> Framework as used in IMP H5 and Kronolith is tremendous, it's not
> something one would express as a series of patches.
I totally appreciate this, but as I said, it's most probably just a  
small issue in the Javascript Frontend Code - somebody must have at  
least a rough idea, how D'n'D was implemented then and now.

Cheers

Chris