deposit: increase autocomplete limit

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: sanity check when importing

* Avoid error when there are no arXiv categories or when there are
  no authors.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
fabfile: remove any previous build folder on deploy

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
harvester: new module to include harvesting workflows

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>