Author: Jun Pataleta
MDL-54976 mod_scorm: Add validation for availability dates
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b5d947c09e2ad051ac3a5818369d06d99856d940
http://github.com/moodle/moodle/commit/b5d947c09e2ad051ac3a5818369d06d99856d940
+ 3.0 en [closebeforeopen,mod_scorm]