deposit: license field addition

* Adds licenses Knowledge Base.

* Adds license field to the deposit form.

* Maps license and license url to MarcXML.

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
deposit: nonpublic note length fix

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>