Enhance booking acknowledgements with a HotelCode, not only the ID of the booking

Enhance booking acknowledgements in OTA_NotifReport:GuestRequests to not transmit only a UniqueID of the booking, but optionally (!) also the HotelCode. This is for having an enriched log on channelmanager side.

HotelCode in BasicPropertyInfo might be the right attribute.

Pro:

additional crosscheck
it's a real use case that might be useful

Contra:

All info is already there
Marking this "optional" needs an agreement between partners
?

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