Roles support added: enrol/authorize:managepayments
Roles support added: enrol/authorize:managepayments

TO DO:
* $CFG->an_teachermanagepay will be removed.
   XXX??? What will be do while sending email to teachers about pending orders expiring???
   If this feature enabled and a teacher no role in managepayments, this will send an email and the teacher cannot manage payments.
   Extra work: get_course_teachers and a teacher has_capability(at course level), send this email.

* convert isteacher to has_capability.

dilawar/moodle