Author: Ruslan Kabalin
MDL-71571 enrol_meta: Add webservices for adding and deleting instances.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=80bcf0d74045a630aa3e90cfd9ff83916d0e4740
http://github.com/moodle/moodle/commit/80bcf0d74045a630aa3e90cfd9ff83916d0e4740
+ 4.0 en [wscannotcreategroup,enrol_meta]
+ 4.0 en [wsinvalidcourse,enrol_meta]
+ 4.0 en [wsinvalidmetacourse,enrol_meta]
+ 4.0 en [wsnoinstancesspecified,enrol_meta]