Bring Maven dependencies more inline with Ibis4Voorbeeld

This also includes the following features included in newer jar versions
recently added to Ibis4Voorbeeld:

- Prevent java.io.NotSerializableException thrown by Struts and Test
  Tool when the application server wants to persist sessions.

- Prevent problems with control characters in Test Tool GUI (replace
  them with inverted question mark + "#" + number of character + ";").