Improve Java main class detection by using Java's reflection API
Show result of too-late submissions to jury.
Write to event table and auditlog in case of compile errors.
Only add result to event table once.

If the final result was known after the xth of N test sets, it was
written to the event table N-x+1 times.
Order by shortname instead of probid.
Consistently use https://lists.a-eskwadraat.nl for mailinglist URLs.
Fix Java main class detection; only look for class files in the submission directory.
Suppres PHP notices if metadata file is empty.
Make successful compile output collapsed instead of shown
in title tag. Also rename function to 'display_compile_output'
in line with 'display_runinfo'.
Use consistent domjudge_* for cookie names.
Fix HTML: condense duplicate class attribute into single list.
Fixing apt-get install recommendations in manual.
Install restapi.secret and create_cgroups.
Allow Debian/Ubuntu repository mirror and proxy to be passed
as environment variables to chroot create script.
Code layout changes and use SQL 'USING' where possible.