Author: Marina Glancy
MDL-58635 blogs: check edited blog belongs to current user
http://git.moodle.org/gw?p=moodle.git;a=commit;h=27795d1eedfff2f7af2bff5d14624da38aff41a3
http://github.com/moodle/moodle/commit/27795d1eedfff2f7af2bff5d14624da38aff41a3
+ 3.0 en [wrongexternalid,core_blog]