deposit: top save form removal

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: usability changes

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: change of hiding method of hidden fields

* Uses HiddenInput widget in forms.py, and hides
  all leftovers generic using class based jQuery
  selector in fillform.js.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>