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=f91e143f1d17f6fe51409917ba4aa1c5b4c1a3f7
http://github.com/moodle/moodle/commit/f91e143f1d17f6fe51409917ba4aa1c5b4c1a3f7
+ 2.9 en [unabletomessageuser,core_message]