Added TODO methods to image, fixed up StdChoice.
We need a central HashMap of StdChoices mapped by name with a static
method so anyone can look up a StdChoice object by name and get
an array of Answer objects.

The methods in the MultiChoice objects should be changed to use
getAnswers().
That method should either return an array of answers in the object, or
if it contains a name of a standard Choice object, it should return the
array from that standard choice.