Author: Ruslan Kabalin
MDL-32009 messaging: Add message processor uninstall functionality
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3f9d9e285672967755f00859c00fc02e2ff9ae59
http://github.com/moodle/moodle/commit/3f9d9e285672967755f00859c00fc02e2ff9ae59
+ 2.3 en [processordeleteconfirm,core_message]
+ 2.3 en [processordeletefiles,core_message]