What new features does the open-source code from this article add?

The open-source code, available on GitHub, adds four new features: `AddForward` to add email forwarding, `GetForward` to view forwarding settings, `GetShare` to view folder sharing configurations, and `RemoveForward` to clear forwarding. These expand the functionality of the `Zimbra_SOAP_API_Manage` project and are built on the techniques explained in the Zimbra SOAP API Development Guide 5 - Email Forwarding and related guides like Zimbra SOAP API Development Guide 3 - Email Operations.