Author: Damyon Wiese
MDL-41241 atto: Add a checkbox for open in new window to links
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5d2d0e12d53e747ba419c81e244be3ae768dcc90
http://github.com/moodle/moodle/commit/5d2d0e12d53e747ba419c81e244be3ae768dcc90
+ 2.6 en [openinnewwindow,atto_link]