collect: addition of sorting filter

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
uploader: initial manage command implementation

* Adds basic `inveniomanage uplaoder insert -f FILE` command.
  (addresses #1772)

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
oaiharvester: authorlist extraction task

* Updates post-process task for authorlist extraction to
  properly fall back to the default XSLT stylesheet.

* Adds a check that the script file is found for the filtering
  script task.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>