Extra validation for Rate question with not enough data.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Replaced all numeric occurrences of type_id with their CONSTANT value as defined in questionnaire.class.php

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Code checker clean-up.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
removed choose_group_form.php and simplified groups selection and navigation

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
updated releasenotes.txt

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Modified viewallresponses capability setting.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
added "return to course" button to advanced settings form

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>