Procuret Python 0.0.25

0.0.25 adds:

• SecondFactorCode, now required for all Session creation. Session.create... methods updated accordingly.
• SaleNomenclature enumeration
• New properties for InstalmentLink
  • .allow_edit: bool
  • .sale_name: SaleNomenclature
  • .denomination_id: int
  • .denomination: Currency