Author: Andrew Davis
MDL-31429 enrol: added db/messages.php for enrolment plugins and added some smarts to messaging so it won't display message settings for disabled enrolment plugins
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d04cc1ea24562884ee3da0209591a3a8bb4324e4
http://github.com/moodle/moodle/commit/d04cc1ea24562884ee3da0209591a3a8bb4324e4
+ 2.1 en [messageprovider:flatfile_enrolment,enrol_flatfile]
+ 2.1 en [messageprovider:imsenterprise_enrolment,enrol_imsenterprise]