Method that will be call each time a new instance of a class is created.
By extending this method it is possible to have static code that is called each time a new instance of a class is created.
The static instance of this class.
extend() in the Object class will call this method just
before returning and it will pass the static instance of the class as a
reference. Note that method should never be called explicitly.
Any value returned by this method will be ignored.
For more information see
## Not run: For a complete example see help(Object).