Remove old browser CSS.
Fix code style problems.
Add many PHPdocs.
Set @package uniformly.

Also remove old translations that are now in AMOS, and add some unit
tests.

The OU question types are now available from https://github.com/timhunt.

Todo rendering questions with files, and ddwtos javascript.

Todo rendering questions with files, and ddwtos javascript.

Now there are no longer fatal errors that break other qtypes, but these two qtypes still not work completely. More to come.

Now there are no longer fatal errors that break other qtypes, but these two qtypes still not work completely. More to come.