Add missing fields for the OrderResponse Data Model to the Ontology.

[AchillesDougalis]

Add the following misssing fields of PEPPOL's OrderResponse Data Model to the Ontology:

• BT-ORDI-1-4-9 with name: "URL for download" and description: "The URL that can be used to download the ordered products".
• BT-ORDI-1-4-10 with name: "Cloud service URL" and description: "The URL that can be used to use the ordered products".

Suggestion to add them as attributes either to epo-ord:OrderResponseInformation or to epo-ord:DeliveryInformation.

[andreea-pasare]

Implemented model as of ePO 5.0.0: