Author: Serge Gauthier
MDL-52432 tool_lp: Add ability to unlink a plan from its template
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a8902ee2d73e48a40a5b9f246a20c5fe2f0e29f1
http://github.com/moodle/moodle/commit/a8902ee2d73e48a40a5b9f246a20c5fe2f0e29f1
+ 3.1 en [unlinkplantemplate,tool_lp]
+ 3.1 en [unlinkplantemplateconfirm,tool_lp]