Author: Jean-Michel Vedrine
MDL-48715 mod_lesson: use only one field for time spent rule
http://git.moodle.org/gw?p=moodle.git;a=commit;h=10e2355f8c803e82427afafa46c1824e090011bf
http://github.com/moodle/moodle/commit/10e2355f8c803e82427afafa46c1824e090011bf
+ 2.9 en [completiontimespent,mod_lesson]
+ 2.9 en [completiontimespentgroup,mod_lesson]
- 2.9 en [completiontimespend,mod_lesson]
- 2.9 en [completiontimespendgroup,mod_lesson]