jsonalchemy: cache engine search fix

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
archiver: initial port to new code structure

* Implements OIS archiver module using bagit.  (addresses #1579)
  (addresses #2258)

Co-authored-by: Jake Cowton <jake.calum.cowton@cern.ch>
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
base: dropdown menu and mobile UI

* Makes admin menu looks embadded in dropdown. (closes #1994)
* Fixes messages dropdown.

Signed-off-by: Adrian Pawel Baran <adrian.pawel.baran@cern.ch>