-MDL-38147 deprecated get_children()
-MDL-38147 deprecated get_categories()
-MDL-38147 removed get_db_record() from tests
-MDL-38147 removed coursecat::get_db_record()
MDL-37009 Deprecated all courses display functions that are not used any more

print_my_moodle(), print_remote_course(),
  print_remote_host(), print_whole_category_list(), print_category_info(), get_course_category_tree(),
  print_courses(), print_course(), get_category_courses_array(), get_category_courses_array_recursively()