deleting the letters in the results
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Delete the field 'publication date' in exercises and add the field 'is published
Exercises are displayed only if 'is published' is True
Change Question of exercise to textarea (and display it with linebreaksbr as necessary)
enlarge text area to put answer
possibility to put all image type, audio, and pdf inside the question
"submit" button bug: still here even if score in exercise is > to 75
Result_choice are displayed in horizontal, all students are displayed, even when the exercises haven't been done
add a field 'title' (better than Discipline and Exo_number to track the exerercise. Field 'title' added to all the pages.