Creates a webservice that returns the addable blocks in a given page.
The webservice expects the page context id, page type and page layout as
parameters and returns the block name and block title for each available
block.
Starting from PHP 7, most language errors throw Error exceptions. We
want to deal with those equally as with any other exception so we need
to catch all Throwables here.
There are serveral ways a quiz attempt can be submitted:
1. The student click the Submit and finish button. In this case,
no problem. We record the current time as the finish time
for the quiz attempt.
2. The student is activly working away at the quiz, and the
count-down timer reachers zero. In this case, we also record
the current time. Note that, if the server is under high load,
then this could well end up being a few seconds after the
theoretical end time, so you could have a quiz with a 30 minute
time limit, with an attempt that lasted 30:07. However, this
is just an accurate reflection of what happened, so should
be recorded like this.
3. If the student is offline when the time expires, then
(depending on the quiz settings) the attempt may be
automatically submitted by cron, but this will happen with
at least some delay (to prevent race conditions between cron
and a student working online) and if cron is running slow
on the server, it could be a lot later. Previously, this led
to, say, a 30 minute quiz where an attempt seemed to have
lasted 67 minutes, which confused people.
Now, in this situation, the finsh time for the quiz attempt is
recorded as the time when the time limit ran out. This is not
just less confusing for teachers looking at the quiz report,
it is also more accurate. That is the latest time at which
students could have made any changes to their responses.
* Set appropriate heading element IDs
* Replace usages of deprecated HTML tag acronym with abbr instead.
* Add a label for the export fields fieldset.
* Move the CSV delimiter list outside the radio group.
* Fix div under a label element and duplicate labels
for the checkboxes of the fields to be exported by showing the field
name and type together.
* Group the fields to be exported as a fieldset.
* Move unsupported fields into a separate list.
* Move export options into its own section and group the options as a
fieldset.
