users in classes were labeled with dotlrn_member_rel if they were not added from the class administratio page. This caused issues with bulk-mailing them by role. Includes upgrade script to properly label these users as dotlrn_student_rel
-performance: writing the function source code instead of calling the plsql function trying not to use views-new stuff: adding the option to store the files in the file system (this is the default now)
