CONTRIB-4750 Postgres needs to be told to order responses by submitted time ASC

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4757 :: Remove the report "summary" stats page for questionnaires with only one response

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4760 :: N/A column report display is incorrect for Rate questions with N/A option selected

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4764 :: When deleting a question, number of existing responses to that question is sometimes wrong

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