Author: Huong Nguyen
MDL-72385 tool_usertours: Improve and simplify design of user tours
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b3df2aba6272ffd745645d0bedbdfccf9c9fa0cd
http://github.com/moodle/moodle/commit/b3df2aba6272ffd745645d0bedbdfccf9c9fa0cd
+ 4.0 en [skip_tour,tool_usertours]