created. Works OK after limited testing.
I've also renamed some strings to do with "Random Match", so that this
question type is now called "Random Short-Answer Match".
Later there will be a new 'Random Match' which randomly selects one of the
existing "Match" questions.
... this grade is used as the default grade when adding questions
to a quiz.
At the moment it's just so that some imported questions can have
different defaults, but a field should be added to all question
editing pages.
