Author: Ryan Wyllie
MDL-50426 message: optional permission check on message
Changed the messaging API to allow you to provide a parameter
that will cause the code to check if the sender of the message
has the correct permissions before the message is sent.
The ajax messaging (message button on profile page) has been
updated to perform these permission checks. This brings it
inline with the existing private message page.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cd0c9ac87d75b3d893d61df21e3ecfd12c065c1f
http://github.com/moodle/moodle/commit/cd0c9ac87d75b3d893d61df21e3ecfd12c065c1f
+ 3.0 en [unabletomessageuser,core_message]