Issue #534 by pjohans: Make interest_period required to avoid --none-- selection.
Issue #534 by pjohans: Get default_interest period for reservations
Issue #534 by pjohans: More correct use method alma_reservation_default_interest_period to get interest period.
Issue #534 by pjohans: Undo make interest_period field required.
Merge pull request #17 from pjohans/development

Get default_interest period for reservations