Students can't take the quiz if anyone has passed

Found an error during testing that was caused by one of the previous patches. The check to see if the student had passed the quiz was missing the uid parameter. This was resulting in a situation where non quiz creators could not get passed the quiz check if anyone had passed that quiz.

This patch fixes the issue. It is based on:

http://drupal.org/node/27133
http://drupal.org/node/88675
and the administer quizzes patch from http://drupal.org/node/26998

Currently, we are looking to commit all four of these patches today to help keep the version confusion to a minimum. My apologies for the bug and as always, suggestions are welcome.