grade_on_demand.php:  Cleanup.
kick_grade.php:  added to facilitate allowing a user to be able to submit a grade to a TC on demand from within moodle.
TODO:  This needs to dovetail more nicely with moodle, and should only appear when the tool is launched from a TC.  When the course the provider is serving tools off of is accessed via moodle, it should be invisible to the students.
return_grade:
Added some extra mtrace statements to allow for easier troubleshooting when things don't work as expected.
Fixed grade submission so it actually checks the XML from the TC properly before setting a grade.