Need to account for body margin when calculating whether to float the
user column.

Grade restriction is now broken into 3 lines - but it needed custom
padding.

Adrian Greeve authored Nov 02, 2016 and Eloy Lafuente committed Nov 11, 2016

If the grader does not have the accessallgroups capability,
or groups mode is set to separate groups and the user is not
a member of the group then no participants are shown.

Some DBs have troubles to execute such a huge query as generated in this
test. We do not actually need to execute it. All we need is to make sure
that the parameter placeholders are enumerated correctly. So it is what
this new test does.

Update the HTML coming from the JS to include bootstrap classes.
Delete as many styles from boost scss as possible.
Regression test on clean and do final tweaks in less.

Labels containing only accesshide text should have the accesshide class
on the label, not the content so the label does not push the content
down.

Fixes from lines in the previous commit.

Grader report has custom overflow handling which does not cope with a
scrollable content region. So we need to make the content region flow
weirdly out to the right of the page, and push the blocks underneath -
even on really wide screens where it looks bad. We also needed to
upgrade the custom scroll code to handle the margin on the body
changing.

Users won’t be updated if:
- They are admins and the user updating is not
- They are the guest user
- They are mnet users
- They are deleted users

Some "select" based form elements are not inheriting directly from
MoodleQuickForm_select - so did not have the adjustment to the form
field name that allows multiple values. I moved this fix to the
templateable trait so all the form fields get this fix.