Included is a bug correction to categories_delete_move() which does not
respect showfeedback parameter, printing feedback even when not wanted
(this breaks the webservice output)
Conflicts:
admin/webservice/testclient_forms.php
lib/db/services.php
1. Implement core_course_get_contents web service
2. Implement callbacks in folder, resource, page and url modules
3. Implement download script for web service
1. moodle_user_get_course_participants_by_id web service to get user details in course context
2. Fixed the proformance issues of get_users_by_id web service