Compliance: Moves add- and amend_fields to compliance_check

* Due to missing generality, the functions add_fields and
  amend_fields are moved from utils.py to compliance_check.py

Signed-off-by: Martin Vesper <martin.vesper@cern.ch>
Nations: Reworks nations.py to use the field 700__w

* Changes nations.py to use the field 700__w for the nation
  counting

* Moves NATIONS_DEFAULT_MAP to utils.py

Signed-off-by: Martin Vesper <martin.vesper@cern.ch>
Fix for displaying delivery dates when DOI wasnt registered yet.