MDL-8223

MDL-8223
require_login issues:
* does not accept $course object as parameter - see require_course_obejct()
* always uses global $course even when courseid empty
* overrides global $course - problem it contains something else than $course object

require_course_login issues:
* does not accept courseid as parameter
* does not pass $cm to require_login when forced login to site - not a major issue because there are extra visibility checks in modules - we can remove them now ;-)