Manual add-on lines

In a B2B booking process, it is now possible to add fare lines manually.
For each manual service added, the agent chooses :
- A service label
- A typology from the distributor’s categories
- Opacity: An opaque service is one that will be added to the total price and will not be visible to the customer in the file details.
- Volatility: A volatile service is one that is not sent to the distributor. It appears on the quotation page to be shown to the customer, but disappears when the travel agent actually books with the distributor, so it is not sent to the distributor.
- A quantity
- A price
