Author: Jamie Pratt
MDL-47494 ddmarker: allow for 2,3,4,5,6 drags not just 1 or infinite
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e1f5f60197876b46c549ef045c1357f7779ccda1
http://github.com/moodle/moodle/commit/e1f5f60197876b46c549ef045c1357f7779ccda1
+ 3.0 en [noofdrags,qtype_ddmarker]