Author: Andrew Robert Nicols
MDL-38166 mod_data Add option to open url in a new window
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6f07bf766b2b314b8f1b1b5fccf8ea7ec3f9efaf
http://github.com/moodle/moodle/commit/6f07bf766b2b314b8f1b1b5fccf8ea7ec3f9efaf
+ 2.5 en [openlinkinnewwindow,datafield_url]