Implementing file upload.

upload_form.tpl:
 - Added "degree course" select. 
 
Control\Upload :
 - getForm() now sets a smarty variable to populate the degree course
select in upload_form.tpl.

Entity\Subject :
- Removed "use Control\DegreeCourse". Why it was there ?_?

Foundation\Subject : 
- Added getByName_DegreeCourse().