Don't use copy constructors, as they will cause a stackoverflow

[tknell]

• As the Beanfiller defaults to the same constructor each time, it tries to create another object with the same copy constructor until the program reaches a stackoverflow
• Copy constructors (more specifically constructors with the same object that should be created as parameter) will no longer be used
• When the only available constructor is a copy constructor, there will now be an exception that another constructor must be provided