base: adaptation to new search form from invenio

* Changes usage of search_form macro to include
  of search/form/index.html.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Tested-by: Javier Martin Montull <javier.martin.montull@cern.ch>
config: add CFG_SITE_LANGS

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
workflows: INSPIRE specific harvesting workflows

* Adds customized INSPIRE specific harvesting workflows for use
  with the invenio.workflows module.

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