Author: Sara Arjona
MDL-73891 admin: Display a notification in manage blocks
An info notification has been added to the "Manage blocks"
page to warn admins about the "Unneeded blocks" theme setting.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a9f15ed952bb29c8d9f4d88a51c755b4d01db66d
http://github.com/moodle/moodle/commit/a9f15ed952bb29c8d9f4d88a51c755b4d01db66d
+ 4.0 en [noteunneededblocks,core_admin]