Remove an outdated comment.
QuestionFragment: Move the hard-coded discussion question ID and answer to Config.
Put back some whitespace that I like.
In portrait mode, try to reduce the changes of image height.

By remembering how big the question/answer part has ever been,
and making it always be that big. This means that the image resizes
during the first classification, but not afterwards.
It will resize again if you don't use the "Is there anything Odd?"
question until later.
This is far from ideal.
IconsCache, DecisionTree: Get a list of all questions instead of traversing the tree.

Add DecisionTree.getAllQuestions() for lower-level things like loading all the
icons and example images. It simplfies the code greatly.