Author: Jamie Pratt
MDL-47494 ddmarker: OU-2407 allow tags in markers
relaxed form validation and hardened js
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5a34e0b0374125de7292f8be1ea56b2237bbec3d
http://github.com/moodle/moodle/commit/5a34e0b0374125de7292f8be1ea56b2237bbec3d
+ 3.0 en [formerror_onlysometagsallowed,qtype_ddmarker]
- 3.0 en [formerror_notagsallowed,qtype_ddmarker]