Author: Shamim Rezaie
MDL-61132 Questions: Question Bank amendments to cope with Top category
* Display "Top" categories in the category filter when listing questions in the question bank
* Prevent editing "Top" categories
* Prevent deleting "Top" categories
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9275220de3ad0dc8d94ac2075317f5b76bb1a9b3
http://github.com/moodle/moodle/commit/9275220de3ad0dc8d94ac2075317f5b76bb1a9b3
+ 3.5 en [cannotdeletetopcat,core_question]
+ 3.5 en [cannotedittopcat,core_question]