Author: Brendan Heywood
MDL-68874 dml: Add SQL stacktrace debugging mode
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ef4145dd1a660eceaedff08cf15518edecb06c19
http://github.com/moodle/moodle/commit/ef4145dd1a660eceaedff08cf15518edecb06c19
+ 4.0 en [debugsqltrace,core_admin]
+ 4.0 en [debugsqltrace1,core_admin]
+ 4.0 en [debugsqltrace2,core_admin]
+ 4.0 en [debugsqltrace100,core_admin]
+ 4.0 en [debugsqltrace_desc,core_admin]