app/ExerciseQuestionsHTML: Deactivate online editor for binary files.
app/ExerciseQuestionsHTML: Deactivate online editor for binary files (properly).
app/ExerciseQuestionHTML: Allow direct download of submissions.
app/ExerciseQuestionHTML: Show previous score.
core/dojo/User: Give admin password supercow power.
app/static/css/hackojo.css: Adjust console size.