Add Apache 2.4 example.
Publish standings to ICPC from jury scorecache.

You will always want to publish the final standings, never the frozen ones.
Fixes #146
Prevent mistaken standings upload while contest still running.

Fixes #146
Need to get ranks from jury point of view.

Thanks @baierjan for noticing.
Update to reflect ICPC webservice changes
Make configuration API only available to jury and limit submissions output to valid ones.

The amount of info available through the configuration variables may not
be stellar, but it's not always published in another form, so limit access
to prevent surprises.

For submissions, it makes sense not to include invalidated submissions
by default. If someone has a usecase for getting those, we can add an extra
query parameter.
Warn when judging without cgroups.

Using cgroups is highly recommended; it provides much more job control, and
in particular, Java judging without it is nowadays pretty uncomfortable.
Combine bare-install/install commands

Reduce duplication of code between bare-install and install
Bare-install will now configure a password for judgehosts based on the
restapi.secret file

Fixes #144
Allow judgedaemon to work for multiple servers

Multiple lines can be specified in the restapi.secret file, each
specifying a different domjudge installation to use
Submissions are judged round robin style
Add ID column to restapi.secret file

Rather than use a number based on which entry, assign an ID to
each endpoint. Use this in the workdirpath instead. This gives
us stable directory names even if entries are added or removed
from the restapi.secret file
Make unverified clause for submission list more precise
to filter out simulated submissions that are verified, but
do not have a judgehost.
Merge parse_scoreboard script into simulate_contest script,
add option to specify team category and update to current
database layout.
Add SQL structure for contest-problem many-to-many mapping.
Add problem 'hello' to demo practice session as well.
Uniform layout of SQL example data.
WIP: change SQL queries on probid.
Update documentation on probid keys.