Fixed small display bug on "all your responses" report page using branching feature.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
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>
Merge branch 'MOODLE_25_STABLE' into MOODLE_25_BFC