Add a new toString method to match offline convention
In several SciFi documents, dataLink is in [1-3], whereas we store it in the source ID as [0-2]. This adds a method that allows to print the SciFi-convention name. @bleverin
In several SciFi documents, dataLink is in [1-3], whereas we store it in the source ID as [0-2]. This adds a method that allows to print the SciFi-convention name. @bleverin