BibUpload: fix sender msgpackable value

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
search: fix for collection preservation on search

* Addresses an issue when searching from within a collection and cc
  parameter was not preserved.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
celery: task registry addition

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
base: signal webcoll_after_reclist_cache_update

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>