search: fix for return key handling in search form

* Fixes an issue where pressing the return key in the simple search
  dropdown caused the form to be submitted with no data. (closes #2253)
  (PR #2282)

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Joe MacMahon <joe.macmahon@cern.ch>
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>