Author: Ruslan Kabalin
MDL-27171 messages: add message outputs management interface page
This introduces the page for management message outputs (processors) where
admin may enable/disable them and jump to configuration pages.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=75c34c23a40c1b1dd6cd4d9aba727b450d0b696a
http://github.com/moodle/moodle/commit/75c34c23a40c1b1dd6cd4d9aba727b450d0b696a