Author: Frederic Massart
MDL-51868 tool_lp: Create evidence persistent
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a6ec05b675ea468016b3a653b8b69cca1d2c77ad
http://github.com/moodle/moodle/commit/a6ec05b675ea468016b3a653b8b69cca1d2c77ad
+ 3.1 en [invalidevidencedesc,tool_lp]