Add all professors to the graph

[JakovTomasic]

As of now, not all professors are added to the graph because their office doesn't exist or the node doesn't have the same name as their office name.

[JakovTomasic]

To do this, you will also need to add some nodes to the graph, making it more complete.

[JakovTomasic]

Professor data fixes that are wrong on the RiTeh website:

• Kristijan Lenac should be in office 1-49c
• Goran Mauša in 1-49d